We have flown twice with DS, once when he was 4 months and again last week at 9 months. I nursed on the plane both times without a cover and he fell asleep on each leg of the trip. I also pumped and brought bottles just in case I was sitting next to someone I didn't feel comfortable nursing around, but generally speaking others moms and women are very supportive. His ears didn't seem to bother him in the least despite all the warnings I got about that. 3 months is a good time to travel because they aren't mobile yet and wiggling to get down off your lap, instead they like the extra snuggles! The only thing I wasn't prepared for was the noise startled him the first time we flew because we had seats in the back of a larger plane. Flying in the evening works best for us because the lights are dimmed so its easier to coax a nap. Good luck mama!
Wife. Midwife. Mother. Not necessarily in that order depending on the day!