The aviation industry has placed strict requirements on what type of soft-sided pet carriers that can be brought onboard. The carrier must have a liquid proof bottom AND provide excellent ventilation at all times (even when fully closed). Our carrier fulfills both requirements. Firstly, the carriers fabric is coated on the inside to prevent accidental leaks in case of an accident and secondly equipped with at least three mesh windows for optimal ventilation at all times.
You must also check the onboard dimensional requirements for pet carriers on your airline as all providers vary.