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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.

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N4521KCessna 172S SkyhawkActive

Cessna 172S SkyhawkOwned

Rank 1 of 4 by operating margin

Jul 1, 2026 – Sep 30, 2026

2026-07-01 to 2026-09-30

to
Revenue
$44,289
−29%vs. previous period
Hours flown
239.4
−30%vs. previous period
Revenue/hr
$185
0%vs. previous period
Utilization
26.8%
−12 ptsvs. previous period

Monthly performance

Apr–Sep, by calendar month.

Upcoming inspections

Maintenance
Due dateItemHours / intervalStatus
Nov 5, 2026estNext 100-hour76.7 hours to go
23% of the way
In 36 days
Dec 31, 2026Next annual12 calendar months
76% of the way
In 92 days
April 2028estOverhaul790.0 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−$13,186 est

It went from $54,320 to $41,134; 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 $41,134, down $13,186 from $54,320 in the previous period (Apr–Jun 2026); N4521K accounts for $11,007 of that change.

Operating margin: $41,134
Previous period: $54,320
N4521K change: -$11,007
Operating margin: $41,134
Previous period: $54,320
N4521K change: -$11,007

Facts from your data, not a diagnosis.

  • Flew 100.6 fewer hours (239.4 vs 340), costing $9,842. main factor
    Hours flown: 239.4 h
    Hours flown, previous period: 340.0 h
    Hours effect: -$9,842
  • Maintenance cost per hour rose from $19.25 to $30.61, costing $2,721. smaller factor
    Maintenance per hour: $30.61/hr
    Maintenance per hour, previous period: $19.25/hr
    Maintenance effect: -$2,721
  • Fuel cost per hour fell from $59.66 to $50.46, adding $2,202. smaller factor
    Fuel per hour: $50.46/hr
    Fuel per hour, previous period: $59.66/hr
    Fuel effect: $2,202
  • Other changes: −$646. smaller factor
    Other changes: -$646
    Total change: -$11,007

Cancellations are costing N4521K real flying time.

N4521K$6,660 est Scheduled value of cancelled hours

10% of bookings were cancelled or no-shows, 36.0 scheduled hours worth about $6,660 at the usual rate.

Ideas schools in this spot often explore

  • Whether the day most cancellations fall on has something in common: weather patterns, instructor rosters, or a recurring group of students.
  • What's different about the bookings of the instructor on most of them: students, times, or workload.
  • How the cancellation and no-show policy is set: notice period, fees, and whether it's applied consistently.

Ideas, not recommendations. Your situation may differ.

Show the numbers

N4521K had 18 cancelled or no-show bookings (10% of its 189 bookings) covering 36.0 scheduled hours; its revenue per hour was $185.00.

Cancelled or no-show bookings: 18
Cancellation rate: 10%
Scheduled hours: 36.0 h
Revenue per hour: $185.00/hr
Cancelled or no-show bookings: 18
Cancellation rate: 10%
Scheduled hours: 36.0 h
Revenue per hour: $185.00/hr

Facts from your data, not a diagnosis.

  • 7 of the 18 cancelled or no-show bookings fell on a Saturday. smaller factor
    On Saturdays: 7
    Cancelled or no-show bookings: 18
  • One instructor was on 5 of the 12 cancelled or no-show bookings that name an instructor. smaller factor
    With the same instructor: 5
    Naming an instructor: 12
  • 17 of the 18 cancelled or no-show bookings that name a customer were booked again by the same customer within 7 days. main factor
    Booked again: 17
    Naming a customer: 18
    Rebooked share: 94%

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.

Informational only, based on your data. Not financial, legal, or aviation-maintenance advice.