Superfly From Thailand, joined May 2000, 39468 posts, RR: 76 Posted (4 years 7 months 2 weeks 6 hours ago) and read 4240 times:
I am in Chicago with an unrestricted round trip ticket. I am scheduled to come back to San Francisco next Wednesday August 5th on a 757 .
I can come back home sooner or a few days later IF there are any 747-400 equipment subs.
I know United does this a lot and I have usually flown SFO-ORD / ORD-SFO when they use the 747.
N104UA From United States of America, joined Dec 2007, 897 posts, RR: 0
Reply 1, posted (4 years 7 months 2 weeks 3 hours ago) and read 4077 times:
It sometimes is only within a few hours that you know. but sometimes it might be a day in advance but usually not sooner than then so you would need to just check every day and be lucky, but it does happen sometimes.
"Learn the rules, so you know how to break them properly." -H.H. The Dalai Lama