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.
N8123V flew 32% 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
N8123V's 100-hour (about Dec 1, 2026) falls within 14 days of N744PS's 100-hour (about Nov 30, 2026) and N744PS's annual (due by Nov 30, 2026) (projected). N8123V flew 32% of the fleet's hours from 2026-07-23 to 2026-10-20.
N8123V 100-hour: about Dec 1, 2026
Also due: N744PS 100-hour: about Nov 30, 2026
Also due: N744PS Annual: due by Nov 30, 2026
N8123V share of fleet hours: 32%
N8123V 100-hour: about Dec 1, 2026
Also due: N744PS 100-hour: about Nov 30, 2026
Also due: N744PS Annual: due by Nov 30, 2026
N8123V share of fleet hours: 32%
Facts from your data, not a diagnosis.
N8123V: 100-hour (about Dec 1, 2026); it flies about 28.6 tach hours a month, and flew 32% of the fleet's hours from 2026-07-23 to 2026-10-20. main factor
N8123V hours per month: 28.6 h/month
N8123V share of fleet hours: 32%
Also due within 14 days: N744PS's 100-hour (about Nov 30, 2026) and N744PS's annual (due by Nov 30, 2026). smaller factor
Other aircraft due in the same weeks: 1
est Includes estimated values: inferred bills, placeholder fixed costs or allocated fuel. Figures for cancellations, downtime and unbilled ground sessions are estimates by design.
Informational only, based on your data. Not financial, legal, or aviation-maintenance advice.
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
dual
4855.1
4856.1
4125.6
4126.5
gsheets
2026-08-31
dual
4853.6
4855.1
4124.3
4125.6
gsheets
2026-08-30
dual
4852.1
4853.6
4123.0
4124.3
gsheets
2026-08-30
dual
4850.6
4852.1
4121.7
4123.0
gsheets
2026-08-29
dual
4849.4
4850.6
4120.7
4121.7
gsheets
2026-08-29
rental
4848.0
4849.4
4119.5
4120.7
gsheets
2026-08-28
dual
4846.7
4848.0
4118.4
4119.5
gsheets
2026-08-28
rental
4845.5
4846.7
4117.4
4118.4
gsheets
2026-08-27
dual
4843.6
4845.5
4115.8
4117.4
gsheets
2026-08-27
dual
4842.2
4843.6
4114.6
4115.8
gsheets
2026-08-26
dual
4840.8
4842.2
4113.4
4114.6
gsheets
2026-08-26
solo
4839.0
4840.8
4111.9
4113.4
gsheets
2026-08-25
dual
4837.5
4839.0
4110.6
4111.9
gsheets
2026-08-24
dual
4836.0
4837.5
4109.3
4110.6
gsheets
2026-08-24
rental
4834.5
4836.0
4108.0
4109.3
gsheets
2026-08-23
dual
4833.4
4834.5
4107.1
4108.0
gsheets
2026-08-22
cancelled
—
—
—
—
gsheets
2026-08-22
rental
4831.5
4833.4
4105.5
4107.1
gsheets
2026-08-22
solo
4830.0
4831.5
4104.2
4105.5
gsheets
2026-08-21
solo
4828.8
4830.0
4103.2
4104.2
gsheets
2026-08-21
solo
4826.9
4828.8
4101.6
4103.2
gsheets
2026-08-20
solo
4825.5
4826.9
4100.4
4101.6
gsheets
2026-08-20
rental
4823.8
4825.5
4099.0
4100.4
gsheets
2026-08-19
dual
4822.4
4823.8
4097.8
4099.0
gsheets
2026-08-19
dual
4820.4
4822.4
4096.1
4097.8
gsheets
Maintenance
Maintenance/hr (12-month)
$32/hr est
Hourly (100-hour inspections, oil, other flying wear)
$21/hr est
Calendar (annual and other date-driven items)
$228/month
Unscheduled repairs in this range
$2,680
Engine reserve per hour (overhaul cost ÷ TBO)
$21/hr
Maintenance booked in this range
$15,327
Per-hour and per-month figures cover 2025-10-21 to 2026-10-20 (602.5 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
2026-01-12
Calendar
$2,732
Annual inspection N8123V
2026-06-25
Hourly
$2,222
100-hour inspection N8123V
2026-05-17
Hourly
$1,935
100-hour inspection N8123V
Unscheduled repairs in this range
Date
Category
Amount
Memo
2026-02-18
Unscheduled
$780
Vacuum pump replaced N8123V
2026-01-27
Unscheduled
$1,900
Exhaust riser replaced N8123V
Coming up
Next 100-hour
About Dec 1, 2026 (at tach 4,166.5)
60% of the way
est
Next annual
Due by Jan 31, 2027
73% of the way
Overhaul
About March 2030
44% 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 28.6 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
Maintenance2026-01-12 08:00
Back in service2026-01-12 17:00
Maintenance2026-04-02 08:00
Back in service2026-04-02 17:00
Maintenance2026-05-17 08:00
Back in service2026-05-17 17:00
Maintenance2026-06-25 08:00
Back in service2026-06-25 17:00
Maintenance2026-08-02 08:00
Back in service2026-08-02 17:00
Downtime counted against utilization in this range: 45.0 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)
504.6
17.5%
$88,305
−$68,160est
$20,145est
$0
$20,145est
$135est
$139est
Operating cost by category
Fuel
−$34,013est
50%
Maintenance
−$15,327est
22%
Insurance
−$3,762est
6%
Hangar
−$3,858est
6%
Lease payment
−$11,200
16%
Instructor pay
$0
0%
Other
$0
0%
Operating cost
−$68,160est
100%
Loan payments (after the operating margin, not in cost)
$0
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 $9,841 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 $3902026-09 Hangar $4002026-10 Insurance $252 (20/31 days)2026-10 Hangar $258 (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
24.3
8.1%
$4,253
−$8,592est
−$4,339est
−$4,339est
February 2026
34.9
12.5%
$6,108
−$4,509est
$1,599est
$1,599est
March 2026
67.8
21.9%
$11,865
−$7,386est
$4,479est
$4,479est
April 2026
60.4
20.8%
$10,570
−$7,814est
$2,756est
$2,756est
May 2026
77.4
25.7%
$13,545
−$8,486est
$5,059est
$5,059est
June 2026
74.9
25.7%
$13,108
−$11,035est
$2,072est
$2,072est
July 2026
91.3
29.5%
$15,978
−$9,745est
$6,233est
$6,233est
August 2026
73.6
24.5%
$12,880
−$9,294est
$3,586est
$3,586est
September 2026
0.0
0.0%
$0
−$790est
−$790est
−$790est
October 2026 (2026-10-01 to 2026-10-20)
0.0
0.0%
$0
−$510est
−$510est
−$510est
Range total
504.6
17.5%
$88,305
−$68,160est
$20,145est
$20,145est
Cost per hour, month by month
Month
Hours
Fuel
Maintenance
Nov 2025
37.7
$64/hr
$88/hr
Dec 2025
36.1
$67/hr
$19/hr
Jan 2026
24.3
$73/hr
$191/hr
Feb 2026
34.9
$44/hr
$22/hr
Mar 2026
67.8
$73/hr
$3/hr
Apr 2026
60.4
$58/hr
$35/hr
May 2026
77.4
$48/hr
$33/hr
Jun 2026
74.9
$83/hr
$35/hr
Jul 2026
91.3
$80/hr
$3/hr
Aug 2026
73.6
$67/hr
$29/hr
Sep 2026
0
—
—
Oct 2026 (part)
0
—
—
Calendar maintenance (annual inspections and other dated items): 2024 (part) $0 · 2025 $3,073 · 2026 (part) $2,732
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: 25.2 hours a month to cover $2,183 of fixed costs; it flew 52.4 a month. est
Cancelled or no-show: 7% of 368 bookings (12 cancelled, 12 no-shows).