I have frequently flown with my Sissy and also courrier puppies, so I have flown into many airports with various sized yorkies.
A soft carrier is recommended if you are not always going to fly with the same airline as the height under a seat is not consistent between airlines. Also not consistent within an airline if using their "connect" regional carriers (these are usually smaller planes with less space under the seat). The tallest under seat space I am aware of is 11".
The carrier must be under the seat in front of you on all airlines. I would not recommend food or drink in the carrier.
You can always give water if need be during the flight. Many will not eat or drink while in transit.
Potty pads in a restroom stall is a great way to go as most airports have only cconcrete surrounding with lots of noise. Most pups will hold it until you get where you are going.
Keep in mind that all airlines charge for carrying on a pet - there is a charge both ways. You may not be allowed to take the carrier out from under the seat during the flight....
Some airports will let you have the dog out of the carrier while in the airport, others do not. Most will not allow a dog on a leash walking through an airport.
Some airlines require a recent health certificate for your pet - many do not. It is a good idea to at least have proof of your rabies vaccine with you. Also a good idea to have your pet micro-chipped as well as having ID on the dog while traveling. A leash is also a good thing to have with you.
Please let me know if you have any other questions I may not have addressed........
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