When to buy ONE airline seat?

I always bought two seats when I was over 300#, but then I'm short (5'3") and most of my weight is around my waist. A couple of months ago, I bought only one seat and I fit in it just fine. The seat belt was okay, but it was snug. And I couldn't get the tray table down all the way on seats where there was less leg room.

So it all depends on your waist and what's comfortable to you. If it's a short flight, I wouldn't worry about it too much.

 A good way to find out about what your weightloss will be go to search and put in weight loss planner. Then put in the info and it will give you an approx weightloss. It has worked for me by about 2 to 3 pound varience. Good Luck