Can you bring small seat cushion

Yes

Yes. ..my mom and I wish we had last Thursday. And a small throw..we were freezing!! The seats are very narrow and we r skinny and hard as a rock uncomfortable!! The lady next to me was on top if me!! We just said next time we r bringing small shopping bag with pillow and throw

Yes but is not necessary, you better bring a jacket; it's a little bit chilly there.

yes. but be prepared. there is ZERO cell phone coverage out there.