there's a trick we use. Lift the arm up and it will give you a little extra room. If possible get an end seat, you'll have a little extra room with the aisle that way.
Obviously, your hip size will be the true determination on how well you fit into the seat.
Depending on the FA, that little trick may not work. If you are in another person's space, and you can't put the arm down, the airline CAN make you purchase another seat. They don't always, but they can.
i am a size 3x -26 i ususally fly jet blue and have not had a problem yet, although i always get sooo nervous that i won't fit. i do have to suck it in a little to get buckled at first. i didn't even know they had extenders, how do you go about getting that?
I flew Southwest last month and was so worried about their oversized rule that I purchased the extra seat. The flight was completely full and so no refund. The seats on that flight definately seemed smaller than American seats.
. Quite "hippy".
So far I've only needed an extender once. I bet I could have gotten it if my DH was there and could have "muscled" it into place.
A few months ago, I was flying and it turned out to be a different airline form any I've flown before and the lap-belt a-l-m-o-s-t fit. But not enough. When the FA came by all I did was gesture to my waist and put my fingers together like I was buckling and moths "could I get...." . They were extremely discreet. After that when I flew again I just asked upon boarding for one and got it right away. I didn't need it that time, but it was nice to have it and save embarrassment in case I did.