I've experienced it myself searching on United.com. But yes, sticking with a single airline's usually a good idea — there are benefits towards acquiring elite status on a single airline's frequent flyer program (even when we're talking about airline alliances).
I've experienced it myself searching on United.com. But yes, sticking with a single airline's usually a good idea — there are benefits towards acquiring elite status on a single airline's frequent flyer program (even when we're talking about airline alliances).