So this can theoretically be done for any reason (at least from the NW point of view) so long as seats are available? My family is coming back from HNL 2 on awards on NW (HNL-MSP-MKE) and 1 on AA (HNL-DFW-MKE), but the AA schedule stinks and gets in to MKE 2 hours later (even thru ORD only saves 40 mins). The AA flight looks nearly full so presumably they'd want to get rid of someone, and the NW flight at least shows nearly all the premium seats open. What would the odds be of this working on 6/8? Does the fact that the AA ticket is award? I will of course keep checking to see if awards open up on NW as we get closer, but other than this we're stuck with the bad schedules (they originally coordinated perfectly back in Aug when we booked, but both airlines' sched changes didn't work together...).