i personally would just pump in my seat and see if it would be possible to get an empty row.

@karramaej, last time I went to the airport I didn't see a family bathroom :/ I heard a woman pumping electrically in the handicap stall. And how about in the plane?

Most women do it in the family bathroom when they want privacy but ive seen people at seatac airport just pump while they waited for their plane at the gate