So many themes... struggling to find the meaning behind the story

I liked it a lot - it was certainly different. So much that needed to be unpacked with it, though, and nothing too straightforward.

Themes:
Mortality
Traditional vs untraditional values
Lust/Sexuality/Morality
Sexuality in men versus women
Legacy

I want to put something about Feminism in there, but I believe it was not centered on that and instead used as a tool for what I listed above. Perhaps I'm wrong?

I keep thinking back to his last words (I'm flying) which goes back to his father, and more importantly, his magic gloves story earlier. "He finally feels life while flying into the arms of death." The gloves protect the man and allow him to give happiness to others. The only thing is he cannot feel until the gloves are off. Once he takes them off the only thing he feels is death, but he's content and almost happy. Perhaps the gloves came off because of the deaths around him (his father, son, and finally mother) allowing him to finally feel again?

I'd like to think Garp struggled in life - he wanted to be a famous author and lived in his mother's shadow, he wanted a perfect family but affairs got in the way, he was always afraid of dying young - and only when he was at deaths' door with the gloves off did he finally feel alive and free. Or, he finally got to be like his father the pilot and fly/die.