<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Beef or Chicken?:
The EUA/yield management algorithm is taking into account both historical fare-basis bookings as well as current fare-basis bookings (i.e., for an upcoming flight on a given day/time). As would be expected, the release of seats into the F bucket from A/D is done on the basis of this historical booking data and current reservations. But now, wih greater stringency, EUA is releasing *only enough* inventory into F at each upgrade window (5/3/1 days prior to departure) into which only the higher fare-basis reservations will be upgraded, e.g., 6 plats on day 5, 3 of whom on K fare, 2 on Q, 1 on T. Yield management/EUA spots this, so only three seats open up in F. The three on K get the EUA; the 3 on T/Q are skipped. Day 3: Same thing, but for Gold - and the lower fare basis Plats from before (in addition to the lower fare Golds) are nixed out of the running. And so on. Of course, this is the general paradigm, so specific routes and days of the week will throw in different variables. Still, overall, the machination of EUA is different from before.
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This is highly speculative. There is no evidence to suggest that historical booking data is a factor in EUA and I can assure you that CO's CRS/yield management systems are not sophisticated enough to operate in this manner.