Originally Posted by
WWads
9000s can also be non-revenue ferrying flights.
From what I've seen:
GoJet: 6000s,
Endeavor: 3000s
Shuttle America: upper 2000s to lower 3000s.
Compass: 5000s
SkyWest: 4000s, 7000s
Mainline: 0001-2999
Yes, but code share flights also need to be taken into account:
AF: 1000-1049 and 8000s
KL: upper 8000s and lower 9000s
Virgin: 4364-4438
Many other code shares too.