This particular passenger did not need a seatbelt extender that I could tell. I would say she was maybe 300 lbs?
The biggest issue was her body shape. She carried her weight all over her body, including her back, her chest, her armpit region and her arms. This forced her into a constant "arms akimbo" posture, with her arms/elbows jutting into my seat by about 4 inches. If she held her arms low, her arms would press down on top of my arm. If she held her arms high, she threatened to elbow me in the head.
When the plane would move ever so slightly up and down (which, I had never noticed before, planes do pretty much constantly), her sweatshirted arm would rub against my bare are- after several hours, this became pretty uncomfortable. It was too warm to put on a jacket or cover up with a blanket.
But the worst thing was that shewas determined to fully entertain herself- play on her phone, watch the inboard TV (pushing on-screen buttons every minute or two). So she was constantly moving around, which made her elbowing very irritating. I felt like I was in a hockey game.
I am not totally heartless. Would have felt a little badly for her if she seemed to care that she was all over my personal space, if she recognized that her body shape forced her elbows into the space occupied by my seat and sat relatively still reading a book or listening to music. If she expressed even a whiff of regret when I asked her to stop playing her video game.
Later we saw her in the terminal- she could/did not walk normally-very slowly, her body moving from side to side when she walked. It really was a safety issue to have her in an exit row seat. She could not get out of her seat quickly, she could not move easily through the exit row.
Ah, well, such is life. I will try to find time to write a letter to Delta. The airlines need to come up with a good, palatable solution to this.
H