Hello,

I'm trying to book a flight on united.com using their "Enter specific classes of service" feature. I'm interested in booking classes G, H, M, Q, S, U, V, or W. However, I always receive an error message.



I've tried putting spaces inbetween, but once I click search it comes back without spaces. Same if I put in spaces but no commas.

What is the problem here? The "help" section is not providing any. :-)

Thank you!