Spirit Airlines pilots came to "a tentative agreement" with the airline on December 9 over "new terms for their collective bargaining agreement", according to the the Air Line Pilots Association (ALPS).
The ALPS said the agreement represents "an economic gain of US $463 million or 27% over the next two years, with zero concessions".
Ryan Muller, Spirit's master executive council chair said the agreement "stands in stark contrast to previous bargaining cycles at Spirit and other large jet carriers, where pilots have endured years of stagnating compensation while negotiating comprehensive pilot contracts".
Pilots at United Airlines last week picketed a company board meeting, while crew at several other US airlines have been threatening industrial action over salaries.