MCALLISTER WILLIAM· ICAO24 a859d5· last seen 7d ago

N637XL is an Excel-Jet Aircraft XL-2, a single-engine jet operated by MCALLISTER WILLIAM. SkyMeter has tracked 72 flights totalling 38 hours of airtime via ADS-B. The most frequent segment is KPTK to KFNT. Service window in our records spans 399 days. Of those flights, 4 (5.6%) carry at least one detected incident: a go-around, unstable approach, stall warning, or runway excursion. The Excel-Jet Aircraft XL-2 has a maximum takeoff weight of 2,200 lb, light wake category.

About the Excel-Jet Aircraft XL-2

The Excel-Jet XL-2 represents one of aviation's most audacious homebuilt projects: a single-seat personal jet small enough to fit in a standard garage yet capable of genuine jet performance. Designed and kitted by Excel-Jet Aircraft, the XL-2 emerged in the early 2000s as part of a brief wave of ultralight jet experimentation, powered by small turbojets originally developed for target drones and cruise missiles. With a maximum takeoff weight under one ton, it remains among the lightest certified jet aircraft ever flown by private pilots.

The XL-2's appeal lies in its accessibility: builders can complete the kit in roughly 2,000 hours, and operating costs, while higher than piston singles, are a fraction of conventional business jets. Its single PBS TJ-100 or similar microjet produces around 250 pounds of thrust, enough to cruise near 300 knots and climb to the mid-twenties, performance that places it alongside high-end piston singles but with the smoothness and altitude capability only turbine power provides. The type has attracted a devoted if small community of owner-builders, mostly in the United States and Australia, who prize the novelty of jet ownership without the seven-figure price tag.

SkyMeter has tracked flights across airframes and operators, with the largest observed operator.

FLIGHTS
72
all time
FLOWN HOURS
38
tracked time
📍
AIRPORTS VISITED
13
unique
📡
CALLSIGNS
1
18 routes
📅
SERVICE PERIOD
07/16/2025 → 08/20/2026
first → last
INCIDENT RATE
5.6%
4 flagged

Top routes

By flight count

10
6
6
6
1
1
89Y 61D
1
1
1
KPTK 60G
1
KFNT 4Y8
1

Flight numbers

Most-flown by this airframe

1

Aircraft specifications

Excel-Jet Aircraft XL-2

Engines
Single Jet
Vref (approach)
80 kt
MTOW
2,200 lb
Wake category
L

Recent flights

Newest 38 operations of N637XL

38
08/20/2026
2h 10m
No alerts
08/11/2026
12m
No alerts
08/11/2026
24m
No alerts
08/11/2026
16m
No alerts
07/24/2026
56m
No alerts
07/23/2026
1h 30m
No alerts
07/14/2026
13m
△ Low approach-stability score
07/14/2026
14m
No alerts
07/14/2026
15m
No alerts
06/19/2026
10m
No alerts
06/19/2026
14m
No alerts
06/11/2026
25m
No alerts
06/10/2026
15m
No alerts
06/10/2026
41m
No alerts
06/10/2026
35m
No alerts
06/03/2026
15m
No alerts
06/03/2026
16m
No alerts
05/26/2026
43m
No alerts
05/26/2026
36m
No alerts
05/25/2026
22m
No alerts
05/18/2026
15m
No alerts
05/18/2026
14m
No alerts
05/15/2026
27m
No alerts
05/15/2026
14m
No alerts
05/12/2026
49m
No alerts
05/12/2026
13m
No alerts
05/12/2026
29m
No alerts
05/04/2026
20m
No alerts
04/27/2026
13m
No alerts
04/26/2026
45m
No alerts
04/26/2026
28m
No alerts
04/22/2026
1h 20m
No alerts
11/22/2025
1h 3m
△ Low approach-stability score
10/24/2025
21m
No alerts
10/09/2025
20m
No alerts
09/13/2025
23m
No alerts
09/04/2025
28m
No alerts
07/16/2025
17m
No alerts
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