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N4521KCessna 172S SkyhawkActive

Cessna 172S SkyhawkOwned

Rank 1 of 4 by operating margin

Jan 1, 2026 – Oct 20, 2026

2026-01-01 to 2026-10-20

Revenue

$144,226

−21%vs. previous period

Hours flown

780.6

−21%vs. previous period

Revenue/hr

$185

0%vs. previous period

Utilization

27.3%

−7 ptsvs. previous period

Monthly performance

May–Oct, by calendar month; Oct to the range's end.

Upcoming inspections

Maintenance

Due date	Item	Hours / interval	Status
Dec 16, 2026est	Next 100-hour	76.7 hours to go 23% of the way	In 57 days
Dec 31, 2026	Next annual	12 calendar months 81% of the way	In 72 days
May 2028est	Overhaul	790.0 hours to the 2,000-hour TBO 61% of the way	In 569 days

Due date

Item

Hours / interval

Status

Dec 16, 2026est

Next 100-hour

76.7 hours to go

23% of the way

In 57 days

Dec 31, 2026

Next annual

12 calendar months

81% of the way

In 72 days

May 2028est

Overhaul

790.0 hours to the 2,000-hour TBO

61% of the way

In 569 days

Aircraft information

Make / model: Cessna 172S Skyhawk
Ownership: Owned
Engine TBO: 2,000 hrs
Engine hours since overhaul (SMOH): 1,210 hrs (entered Aug 31, 2026)
Current tach: 6351.2
Overhaul cost: $42,000
Hourly rate: $185/hr
Fuel burn: Not set

What the numbers show

Operating margin fell compared with the previous period, mostly on N4521K.

N4521K−$38,115 est

It went from $155,396 to $117,281; the largest part was fewer hours flown.

Ideas schools in this spot often explore

What changed in demand: student starts, renters, weather, or aircraft availability.
The bills behind the cost line that moved most, and whether they're one-off.
Which months in the period drove the change, and whether it repeats each year.

Ideas, not recommendations. Your situation may differ.

Show the numbers

The fleet's operating margin was $117,281, down $38,115 from $155,396 in the previous period (2025-03-14 to 2025-12-31); N4521K accounts for $16,771 of that change.

Operating margin: $117,281

Previous period: $155,396

N4521K change: -$16,771

Operating margin: $117,281

Previous period: $155,396

N4521K change: -$16,771

Facts from your data, not a diagnosis.

Flew 203.7 fewer hours (780.6 vs 984.3), costing $18,172. main factor
Hours flown: 780.6 h
Hours flown, previous period: 984.3 h
Hours effect: -$18,172
Fuel cost per hour fell from $62.93 to $57.82, adding $3,993. smaller factor
Fuel per hour: $57.82/hr
Fuel per hour, previous period: $62.93/hr
Fuel effect: $3,993
Other changes: −$2,592. smaller factor
Other changes: -$2,592
Total change: -$16,771

Cancellations are costing N4521K real flying time.

N4521K$19,585 est Scheduled value of cancelled hours

9% of bookings were cancelled or no-shows, 106.0 scheduled hours worth about $19,585 at the usual rate.

Ideas schools in this spot often explore

How the cancellation and no-show policy is set: notice period, fees, and whether it's applied consistently.
Reminders before each booking, and how easy it is for a student to move a booking instead of dropping it.
A standby list that fills cancelled slots at short notice.

Ideas, not recommendations. Your situation may differ.

Show the numbers

N4521K had 53 cancelled or no-show bookings (9% of its 617 bookings) covering 106.0 scheduled hours; its revenue per hour was $184.76.

Cancelled or no-show bookings: 53

Cancellation rate: 9%

Scheduled hours: 106.0 h

Revenue per hour: $184.76/hr

Cancelled or no-show bookings: 53

Cancellation rate: 9%

Scheduled hours: 106.0 h

Revenue per hour: $184.76/hr

Facts from your data, not a diagnosis.

47 of the 53 cancelled or no-show bookings that name a customer were booked again by the same customer within 7 days. main factor
Booked again: 47
Naming a customer: 53
Rebooked share: 89%

est Includes estimated values: inferred bills, placeholder fixed costs or allocated fuel. Figures for cancellations, downtime and unbilled ground sessions are estimates by design.

Utilization by month

May–Oct, by calendar month; Oct to the range's end. Based on your weekly schedule.

Flights, newest first

Date	Kind	Hobbs start	Hobbs end	Tach start	Tach end	Source
2026-08-31	rental	7483.5	7484.7	6350.2	6351.2	gsheets
2026-08-31	dual	7481.8	7483.5	6348.8	6350.2	gsheets
2026-08-31	dual	7480.0	7481.8	6347.3	6348.8	gsheets
2026-08-30	dual	7478.9	7480.0	6346.4	6347.3	gsheets
2026-08-30	rental	7477.9	7478.9	6345.6	6346.4	gsheets
2026-08-29	solo	7476.9	7477.9	6344.8	6345.6	gsheets
2026-08-29	solo	7475.4	7476.9	6343.5	6344.8	gsheets
2026-08-29	cancelled	—	—	—	—	gsheets
2026-08-29	dual	7473.5	7475.4	6341.9	6343.5	gsheets
2026-08-28	dual	7472.1	7473.5	6340.7	6341.9	gsheets
2026-08-28	solo	7470.8	7472.1	6339.6	6340.7	gsheets
2026-08-28	rental	7469.8	7470.8	6338.8	6339.6	gsheets
2026-08-28	rental	7468.7	7469.8	6337.9	6338.8	gsheets
2026-08-27	rental	7467.7	7468.7	6337.1	6337.9	gsheets
2026-08-27	solo	7466.8	7467.7	6336.3	6337.1	gsheets
2026-08-27	dual	7465.5	7466.8	6335.2	6336.3	gsheets
2026-08-26	dual	7463.8	7465.5	6333.8	6335.2	gsheets
2026-08-26	rental	7462.5	7463.8	6332.7	6333.8	gsheets
2026-08-26	solo	7461.4	7462.5	6331.8	6332.7	gsheets
2026-08-25	solo	7459.8	7461.4	6330.5	6331.8	gsheets
2026-08-25	rental	7458.3	7459.8	6329.2	6330.5	gsheets
2026-08-25	rental	7456.8	7458.3	6327.9	6329.2	gsheets
2026-08-23	maintenance	—	—	—	—	gsheets
2026-08-22	dual	7455.7	7456.8	6327.0	6327.9	gsheets
2026-08-22	no show	—	—	—	—	gsheets

Maintenance

Maintenance/hr (12-month) $26/hr

Hourly (100-hour inspections, oil, other flying wear) $23/hr

Calendar (annual and other date-driven items) $238/month

Unscheduled repairs in this range $0

Engine reserve per hour (overhaul cost ÷ TBO) $21/hr

Maintenance booked in this range $19,617

Per-hour and per-month figures cover 2025-10-21 to 2026-10-20 (934.7 Hobbs hours), so one month's annual or a month with few hours doesn't swing them. The operating break-even uses them too. Operating cost and margin stay as booked.

Largest in this range

Date	Category	Amount	Memo
2026-03-11	Hourly	$2,449	100-hour inspection N4521K
2026-01-30	Hourly	$2,403	100-hour inspection N4521K
2026-08-23	Hourly	$2,365	100-hour inspection N4521K

Coming up

Next 100-hour

About Dec 16, 2026 (at tach 6,427.9)

23% of the way

est

Next annual

Due by Dec 31, 2026

81% of the way

Overhaul

About May 2028

61% of the way

est

Reserve per hour

$21.00 needed

Dates marked est are estimates: the 100-hour from this aircraft's upcoming bookings and its last 90 days of hours (hover it for how), the overhaul projected at about 43.6 tach hours a month, month by month as it flew from 2025-10-21 to 2026-10-20, × 0.67 for its recent trend.

Maintenance downtime

Maintenance2026-01-30 08:00
Back in service2026-01-30 17:00
Maintenance2026-03-11 08:00
Back in service2026-03-11 17:00
Maintenance2026-04-13 08:00
Back in service2026-04-13 17:00
Maintenance2026-05-11 08:00
Back in service2026-05-11 17:00
Maintenance2026-06-07 08:00
Back in service2026-06-07 17:00
Maintenance2026-07-02 08:00
Back in service2026-07-02 17:00
Maintenance2026-07-27 08:00
Back in service2026-07-27 17:00
Maintenance2026-08-23 08:00
Back in service2026-08-23 17:00

Downtime counted against utilization in this range: 72.0 h (times in America/Chicago).

Summary

Hours flown	Utilization Based on your weekly schedule.	Revenue	Operating cost	Operating margin	Loan payments	After loan payments Cash view: includes loan principal	Cost/hr	Cost/hr (12-month)
780.6	27.3%	$144,226	−$73,191est	$71,035est	−$11,092est	$59,943est	$94est	$97est

Hours flown

Utilization

Based on your weekly schedule.

Revenue

Operating cost

Operating margin

Loan payments

After loan payments

Cash view: includes loan principal

Cost/hr

Cost/hr (12-month)

780.6

27.3%

$144,226

−$73,191est

$71,035est

−$11,092est

$59,943est

$94est

$97est

Operating cost by category

Fuel	−$45,134est	62%
Maintenance	−$19,617	27%
Insurance	−$4,099est	6%
Hangar	−$4,340est	6%
Lease payment	$0	0%
Instructor pay	$0	0%
Other	$0	0%
Operating cost	−$73,191est	100%
Loan payments (after the operating margin, not in cost)	−$11,092est

est Includes estimated values: inferred bills, placeholder fixed costs or allocated fuel.

Bars are drawn against the largest category; striped bars include estimates. The percent is each category's share of the operating cost.

Fuel includes $15,199 allocated to this aircraft from fuel with no tail number, split by Hobbs hours each month (an estimate).

Fixed-cost placeholders (no bill booked that month, so the aircraft's monthly field is used): 2026-09 Insurance $4252026-09 Hangar $4502026-10 Insurance $274 (20/31 days)2026-10 Hangar $290 (20/31 days)

Loan-payment placeholders (no bill booked that month, so the aircraft's monthly field is used): 2026-09 Loan payment $1,1502026-10 Loan payment $742 (20/31 days)

By month

Month	Hours flown	Utilization Based on your weekly schedule.	Revenue	Operating cost	Operating margin	After loan payments Cash view: includes loan principal
January 2026	56.0	18.6%	$10,360	−$6,316est	$4,044est	$2,894est
February 2026	52.3	18.7%	$9,676	−$4,711est	$4,964est	$3,814est
March 2026	92.9	30.9%	$17,187	−$10,112est	$7,075est	$5,925est
April 2026	103.3	35.5%	$19,111	−$8,828est	$10,282est	$9,132est
May 2026	111.1	36.9%	$20,369	−$11,075est	$9,294est	$8,144est
June 2026	125.6	43.2%	$23,236	−$9,550est	$13,686est	$12,536est
July 2026	124.1	42.5%	$22,959	−$11,272est	$11,686est	$10,536est
August 2026	115.3	38.3%	$21,331	−$9,887est	$11,444est	$10,294est
September 2026	0.0	0.0%	$0	−$875est	−$875est	−$2,025est
October 2026 (2026-10-01 to 2026-10-20)	0.0	0.0%	$0	−$565est	−$565est	−$1,306est
Range total	780.6	27.3%	$144,226	−$73,191est	$71,035est	$59,943est

Cost per hour, month by month

Month	Hours	Fuel	Maintenance
Nov 2025	61.1	$71/hr	$3/hr
Dec 2025	63.2	$46/hr	$45/hr
Jan 2026	56	$50/hr	$47/hr
Feb 2026	52.3	$69/hr	$4/hr
Mar 2026	92.9	$68/hr	$31/hr
Apr 2026	103.3	$58/hr	$19/hr
May 2026	111.1	$71/hr	$21/hr
Jun 2026	125.6	$51/hr	$18/hr
Jul 2026	124.1	$47/hr	$36/hr
Aug 2026	115.3	$54/hr	$24/hr
Sep 2026	0	—	—
Oct 2026 (part)	0	—	—

Month

Hours

Fuel

Maintenance

Nov 2025

61.1

$71/hr

$3/hr

Dec 2025

63.2

$46/hr

$45/hr

Jan 2026

$50/hr

$47/hr

Feb 2026

52.3

$69/hr

$4/hr

Mar 2026

92.9

$68/hr

$31/hr

Apr 2026

103.3

$58/hr

$19/hr

May 2026

111.1

$71/hr

$21/hr

Jun 2026

125.6

$51/hr

$18/hr

Jul 2026

124.1

$47/hr

$36/hr

Aug 2026

115.3

$54/hr

$24/hr

Sep 2026

—

Oct 2026 (part)

—

Calendar maintenance (annual inspections and other dated items): 2024 (part) $3,086 · 2025 $2,862 · 2026 (part) $0

Maintenance per hour is lumpy month to month (an annual lands in one month); the 12-month rate above smooths it.

Break-even and cancellations

Break-even: 10.8 hours a month to cover $1,115 of fixed costs; it flew 81.1 a month. est
Cancelled or no-show: 9% of 617 bookings (32 cancelled, 21 no-shows).

Transactions, newest first

Date	Category	Amount	Document	Memo	Source	Match
2026-08-31	Flight revenue	$333	standard	N4521K 1.8 hobbs (dual)	quickbooks	matched
2026-08-31	Flight revenue	$315	standard	N4521K 1.7 hobbs (dual)	quickbooks	matched
2026-08-31	Fuel	−$269	standard	Fuel N4521K week ending 2026-08-31	quickbooks	matched
2026-08-31	Flight revenue	$222	standard	N4521K 1.2 hobbs (rental)	quickbooks	matched
2026-08-30	Flight revenue	$185	standard	N4521K 1.0 hobbs (rental)	quickbooks	matched
2026-08-30	Flight revenue	$204	standard	N4521K 1.1 hobbs (dual)	quickbooks	matched
2026-08-29	Flight revenue	$352	standard	N4521K 1.9 hobbs (dual)	quickbooks	matched
2026-08-29	Flight revenue	$278	standard	N4521K 1.5 hobbs (solo)	quickbooks	matched
2026-08-29	Flight revenue	$185	standard	N4521K 1.0 hobbs (solo)	quickbooks	matched
2026-08-28	Flight revenue	$185	standard	N4521K 1.0 hobbs (rental)	quickbooks	matched
2026-08-28	Flight revenue	$204	standard	N4521K 1.1 hobbs (rental)	quickbooks	matched
2026-08-28	Flight revenue	$259	standard	N4521K 1.4 hobbs (dual)	quickbooks	matched
2026-08-28	Flight revenue	$241	standard	N4521K 1.3 hobbs (solo)	quickbooks	matched
2026-08-27	Flight revenue	$241	standard	N4521K 1.3 hobbs (dual)	quickbooks	matched
2026-08-27	Flight revenue	$185	standard	N4521K 1.0 hobbs (rental)	quickbooks	matched
2026-08-27	Flight revenue	$167	standard	N4521K 0.9 hobbs (solo)	quickbooks	matched
2026-08-26	Flight revenue	$204	standard	N4521K 1.1 hobbs (solo)	quickbooks	matched
2026-08-26	Flight revenue	$241	standard	N4521K 1.3 hobbs (rental)	quickbooks	matched
2026-08-26	Flight revenue	$315	standard	N4521K 1.7 hobbs (dual)	quickbooks	matched
2026-08-25	Flight revenue	$278	standard	N4521K 1.5 hobbs (rental)	quickbooks	matched
2026-08-25	Flight revenue	$296	standard	N4521K 1.6 hobbs (solo)	quickbooks	matched
2026-08-25	Flight revenue	$278	standard	N4521K 1.5 hobbs (rental)	quickbooks	matched
2026-08-23	Fuel	−$1,208	standard	Fuel N4521K week ending 2026-08-23	quickbooks	matched
2026-08-23	Maintenance	−$2,365	standard	100-hour inspection N4521K	quickbooks	matched
2026-08-22	Maintenance	−$222	standard	Oil change N4521K	quickbooks	matched

Date