Is a soft sided carrier the only type that will fit under a seat? (I never flew with a cat)
I feel the soft sided carriers are not suitable for the heavier cats, so how much does Boomer weigh? Most carriers will have a weight limit on the tag, so when you go to buy one you can see if it is a correct size.
When an animal is sedated for a flight, is it just a relaxant or are they out cold? (again, I have no clue). If it is just a relaxant, how could the airline people tell? You can just say he is a calm cat.