Demo school. A sample flight school with four aircraft and two years of invented flights and bills (September 2024–August 2026). Sign in to see your own school's numbers.

N4521KCessna 172S SkyhawkActive

Cessna 172S SkyhawkOwned

No flights or transactions in this range; not ranked

Sep 1, 2026 – Sep 30, 2026

September 2026

No flights or transactions in this range.

Revenue

−100%vs. previous period

Hours flown

0.0

−100%vs. previous period

Revenue/hr

—

—vs. previous period

Utilization

0.0%

−38 ptsvs. previous period

Monthly performance

Apr–Sep, by calendar month.

Upcoming inspections

Maintenance

Due date	Item	Hours / interval	Status
Nov 5, 2026est	Next 100-hour	76.7 hours to go 23% of the way	In 36 days
Dec 31, 2026	Next annual	12 calendar months 76% of the way	In 92 days
April 2028est	Overhaul	790.0 hours to the 2,000-hour TBO 61% of the way	In 549 days

Due date

Item

Hours / interval

Status

Nov 5, 2026est

Next 100-hour

76.7 hours to go

23% of the way

In 36 days

Dec 31, 2026

Next annual

12 calendar months

76% of the way

In 92 days

April 2028est

Overhaul

790.0 hours to the 2,000-hour TBO

61% of the way

In 549 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−$25,229 est

It went from $21,384 to -$3,845; the largest part was less revenue per hour.

Ideas schools in this spot often explore

Discounts, packages, or a change in the mix of dual and rental flying that move revenue per hour.
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 -$3,845, down $25,229 from $21,384 in the previous period (Aug 2026); N4521K accounts for $12,319 of that change.

Operating margin: -$3,845

Previous period: $21,384

N4521K change: -$12,319

Operating margin: -$3,845

Previous period: $21,384

N4521K change: -$12,319

Facts from your data, not a diagnosis.

Revenue fell from $21,331 to $0, costing $21,331. main factor
Revenue: $0
Revenue, previous period: $21,331
Revenue effect: -$21,331
Fuel cost fell from $6,207 to $0, adding $6,207. main factor
Fuel: $0
Fuel, previous period: $6,207
Fuel effect: $6,207
Maintenance cost fell from $2,805 to $0, adding $2,805. smaller factor
Maintenance: $0
Maintenance, previous period: $2,805
Maintenance effect: $2,805
Other changes: +$0. smaller factor
Other changes: $0
Total change: -$12,319

N4521K's next inspection falls in the same two weeks as other aircraft's.

N4521K

N4521K flew 48% of the fleet's hours, and the others are due within days of it, so they could all be down at once.

Ideas schools in this spot often explore

Bringing one inspection forward a few days so the aircraft aren't down at the same time.
Whether the shop can take two aircraft in the same week, and how long each would take.
Which bookings fall in those weeks and could move to other aircraft.

Ideas, not recommendations. Your situation may differ.

Show the numbers

N4521K's 100-hour (about Nov 5, 2026) falls within 14 days of N8123V's 100-hour (about Oct 27, 2026) and N744PS's 100-hour (about Oct 28, 2026) (projected). N4521K flew 48% of the fleet's hours from 2026-07-03 to 2026-09-30.

N4521K 100-hour: about Nov 5, 2026

Also due: N8123V 100-hour: about Oct 27, 2026

Also due: N744PS 100-hour: about Oct 28, 2026

N4521K share of fleet hours: 48%

N4521K 100-hour: about Nov 5, 2026

Also due: N8123V 100-hour: about Oct 27, 2026

Also due: N744PS 100-hour: about Oct 28, 2026

N4521K share of fleet hours: 48%

Facts from your data, not a diagnosis.

N4521K: 100-hour (about Nov 5, 2026); it flies about 46.4 tach hours a month, and flew 48% of the fleet's hours from 2026-07-03 to 2026-09-30. main factor
N4521K hours per month: 46.4 h/month
N4521K share of fleet hours: 48%
Also due within 14 days: N8123V's 100-hour (about Oct 27, 2026) and N744PS's 100-hour (about Oct 28, 2026). smaller factor
Other aircraft due in the same weeks: 2

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

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)
0.0	0.0%	$0	−$875est	−$875est	−$1,150est	−$2,025est	—	$94est

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)

0.0

0.0%

−$875est

−$1,150est

−$2,025est

—

$94est

Operating cost by category

Fuel	$0	0%
Maintenance	$0	0%
Insurance	−$425est	49%
Hangar	−$450est	51%
Lease payment	$0	0%
Instructor pay	$0	0%
Other	$0	0%
Operating cost	−$875est	100%
Loan payments (after the operating margin, not in cost)	−$1,150est

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.

Fixed-cost placeholders (no bill booked that month, so the aircraft's monthly field is used): 2026-09 Insurance $4252026-09 Hangar $450

Loan-payment placeholders (no bill booked that month, so the aircraft's monthly field is used): 2026-09 Loan payment $1,150

By month

Month	Hours flown	Utilization Based on your weekly schedule.	Revenue	Operating cost	Operating margin	After loan payments Cash view: includes loan principal
September 2026	0.0	0.0%	$0	−$875est	−$875est	−$2,025est
Range total	0.0	0.0%	$0	−$875est	−$875est	−$2,025est

Cost per hour, month by month

Month	Hours	Fuel	Maintenance
Oct 2025	90.2	$67/hr	$24/hr
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	—	—

Month

Hours

Fuel

Maintenance

Oct 2025

90.2

$67/hr

$24/hr

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

—

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 needs hours flown in the range. est
No bookings in this range.

Transactions, newest first

Date

N4521KCessna 172S SkyhawkActive

Monthly performance

Upcoming inspections

Aircraft information

What the numbers show

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

Ideas schools in this spot often explore

N4521K's next inspection falls in the same two weeks as other aircraft's.

Ideas schools in this spot often explore

Utilization by month

Flights, newest first

Maintenance

Coming up

Maintenance downtime

Summary

Operating cost by category

By month

Cost per hour, month by month

Break-even and cancellations

Transactions, newest first