Thanks all for the input.

Yes, I'm a weenie for not checking things within the allotted 24 hour window. Oh well, live and learn; I'll adjust things and shorten our stay by a day. (Which may be a good thing -- less of our cash siphoned off by Disney... )

FYI, after all taxes and fees, the per ticket price was $590. So I stand corrected: the $150 change fee would be about 25% of the total.

And to Slawecki, no, I don't wave ALL fees, but if I'm worried about retaining happy clients (and my understanding is that UA could use the help in this area), I'd try to work with them, especially if we're dealing with a year lead time. But again, you and others are correct, it's my fault for not paying close enough attention.