Old Nov 2, 15, 9:02 pm
Join Date: Dec 2012
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Originally Posted by United757 View Post
I don't think it has to do with the fact you're in the middle of the trip, you're in Mexico, etc.

I've encountered this before where the flight is under airport control and you can't make any seating changes until check-in, although it hasn't happened in the last year or so for me. How close are you to departure? If it's within a couple days, this could be it.

I may try changing seats on the mobile website or app if you've got that.
This, or are you at an upgrade window? I have gotten this error message when trying to change seats at the 5 day, 3 day or 2 day prior to departure mark. Someone told me it was due to seating changes being locked at the various upgrade windows to allow for upgrade processing. Sure enough, a few hours later I was able to make the change.
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