yes, but most airlines already have blankets. Southwest does not have them. Most airlines who have blankets though are getting rid of pillows or already have with the exception of international flights.
Wrap it around yourself and jump off a building and see if you bounce!
I just end up using different baby blankets. They are thicker than receiving blankets, but it works. You can get some fabric from the fabric store and make one - that might be the best idea. I don't think you should have to stop swaddling if you don'...