[Edward64]

FWIW

https://www.elliott.org/blog/passeng...size-problems/

Official Passengers of Size policies

American Airlines: American Airlines has a clear-cut policy concerning larger passengers. If a customer extends “more than 1 inch beyond the outermost edge of the armrest and a seat belt extension is needed, another seat is required.” The person of size must pay for the additional seat.

• Delta Air Lines: Delta encourages passengers who are unable to fit in the standard seat (17.2″ width) to consider purchasing an additional seat or “upgrade to business class.”
• United Airlines: United has a strict passengers of size policy. If a customer is unable to fit in their own seat with the arm rest down without encroaching on the neighboring seat, the passenger must purchase an additional seat. If the traveler has not purchased the additional seat ahead of time, they will be charged a walk-up rate (some of the most expensive tickets available).
• Southwest Airlines: Southwest has some of the most friendly policies concerning passengers who need extra space. The airline encourages all travelers who believe they may need an extra seat to call ahead and reserve one. This enables the airline to “adequately plan for the number of seats that will be occupied on the flight.” At the completion of the journey, the passenger may apply for a refund of the extra seat.

What are your rights as a passenger of size or their seatmate?

• Fly later. If you’re seated next to a passenger of size who can’t fit into one seat and your schedule is flexible, ask a flight attendant if you can take the next flight. If there’s room on the next plane, you might be better off traveling later.
• Know your legal rights. Unfortunately, you don’t really have that many. The contract of carriage, the legal contract between you and the airline, does not say you have a right to a full seat. Generally, the crew’s attitude is that if you can sit in the seat and use your seat belt, you’re good to go.
• Know what to expect when you complain. As a practical matter, airlines will apologize and maybe offer a voucher for your discomfort. Discreetly take pictures of the incursion and send them with your complaint. If the airline doesn’t respond appropriately, consider asking a third party for help with your case, such as Elliott advocacy.
• Check your airline’s policies before you book. With few exceptions, every airline has its own “passengers of size” policy. Make sure to check your preferred airline’s policies before you book your ticket.