I have been traveling on United with a TSA approved pet carrier - no problem.

I am flying on another carrier where the reqs are much more restricitive 44cm L x 30cm D x 20 cm H

Its the HEIGHTH requirement that seems VERY odd to me. 20 cm is 7.8 inches

the carrier we have is around 10.5 inches.

Doesnt this requirement make NO sense?

I know its not UNITED, but this is more of a general question about pet carriers - why would ANY airline have a requirement so restrictive?

(note: I did post on the "other airlines of South America" forum, but i dont think that forum gets much use.