I travel with my pets all the time on both road trips and flights. Road trips are easier to navigate because I can plan time for their bathroom and water breaks, but in-cabin air travel tends to be trickier. Depending on how long flights are, it can be stressful for both owner and pet.
However, I’ve discovered a few hacks for smoother travel. First, I have found it more convenient to commute with a soft-sided carrying case, as they are easier to stow underneath the seat in front of you. Most airlines recommend these types of pet carriers because they are more pliant than hard-sided carriers. For some pets, flying is stressful and the trip may be long; I line my carrier with a puppy training pad in case my dog needs to go and cannot hold it the entire time. This also makes for easy clean-up in case of accidents.