Funny (not ha ha) to note that CAL ALPA grieved this very provision in the summer of 2011 as the ratios were not compliant then as a result of the parking of the 767-200's. Thought it was a slam dunk, but the arbitrator ruled for the company with a "force majeure" finding because they could not have known of the delay in 787 deliveries.
How many 757's have been parked on the UA side? I've heard the company is not going forward with that planned reduction until after ISL to prevent having to spool up a parallel independent 737 NG program for sUA.