75 fixer,
What is the relative spread on the age of the a/c, as defined by them being either Boeing or Airbus?
The average 73-400's gotta be at least 7 years old w/the 75's even older, compared to the average of the 320 family being at most 2.5 yrs.
One of the reasons that you may not experience a difference would be due to the age of the aircraft. Another reason would be that if the airbii are under lease w/mx costs covered by the lessor, the lessor may be keeping the logistics pipeline full and the mx schedule set for a more intensive level to maintain the dispatch reliability above a contractual set-point.
From my experience with the A-300R, both ER and domestic, they take more mx hours per flight hour than the Boeing to retain the same amount of reliability.
The relatively short stage length historically flown by U really puts it on the birds regardless of their origin.
As another wrench in the field, and, for whatever an unsolicited opinion is worth; you guys have done well by your company and your trade. As a newby, I was trained and never turned away or given poor advice by the "dinosaurs". Since then, I've had occasion to see the sun come up while working adjacent to some of your guys.
Whatever you guys feel you have to do, good luck.