Your anti-QF skirt is showing there Elektra. Al, puts forward a reasonable hypothesis, followed by a reasonable response from Keg, and all you can do is give in to your own predjudices and blather on mindlessly..
I think, going on from what Keg has written, that we are seeing a fleet in transition from the old to the new.
Give it five years and who knows what we will see. Maybe no 767's, (gone to AO), no classics, no 146's, certainly no old generation 737's leaving A380's, A330, 747-400's and NG 737's. As for the 717's who knows... Qf seems pretty happy with them at the moment.