Emily Gillette's lawsuit was filed in U.S. District Court in Burlington on Wednesday.
It comes nearly three years after she was taken off an airplane because she wouldn't cover herself with a blanket while nursing her 1-year-old daughter. Gillette, of Santa Fe, said she was ejected from the flight as it prepared to take off after a three-hour delay.
Her story generated interest around the nation, leading to a protest "nurse-in" in 19 airports.
Gillette's suit seeks unspecified compensatory and punitive damages from Delta Airlines, Freedom Airlines and Mesa Air Group.