Choose your airline wisely
Some airlines have policies for passengers of size, so make sure to see if your airline has one, and what the details of it are. Some airlines have different names for their policies, so look out for policies such as ‘passengers of size’, ‘obese policy’, ‘overweight policy’ or ‘plus-sized policy’.
Contact the airline
If you can’t find enough information on the airline you wish to travel with, especially with regards to their plus size policy, the best option is to contact them directly to see what they can do to help you travel. Don’t be afraid to ask if they can book you an additional seat free of charge, or at least select your seat where you can be most comfortable.
Request a seatbelt extender
Although not a solution to being uncomfortable in your seat, passengers can request a seatbelt extender for their flight. This will make the seatbelt less restrictive and tight, whilst still complying with safety standards.
Consider add-ons
You may want to consider booking an aisle seat on the plane so you'll have more space around you during your flight. Alternatively, you may wish to ask to board last or book priority boarding, this way you don't need to squeeze past people trying to put their bags in the overhead compartment, and instead just walk on board and straight to your seat.