This thread is helpful. I just called customer service to verify pet carrier dimensions. The SW-sold carrier is as described above. The agent could not verify maximum dimensions allowed for other non-SW pet carriers (why?). The under seat dimensions provided by the agent were 19" long, 8.25" high, 14" wide (aisle and window). Based on this discussion, it sounds like we are ok with a soft-sided carrier that can be stuffed below the 8.25" seat height. Frustrating when customer service can't verify for me. I asked whether they measured at the airport and the agent could not verify either.
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