Yes you are correct it is unclear which type of B737 they are going to use ATL to ORD and you aren't allowed to select seats online either for UA 1781.

Maybe it *is* the B737-200... I've always loved how loud they were. Doesn't bug me cuz they are usually pretty short flights.

*HighFlyah*
Boston, MA

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"Fly High, Fly and STAY *UNITED* - that's the only way to do it."