May 27 (Reuters) - Striking workers at RTX's RTX.N Pratt & Whitney approved the company's second contract offer on Tuesday, ending a three-week-long strike, according to a spokesperson for the International Association of Machinists and Aerospace Workers.

Union representatives have previously said the roughly 3,000 striking workers' top priority is getting Pratt to commit to keep work for Lockheed Martin's LMT.N F-35 fighters in the state.

The strike is the first in more than 20 years at the enginemaker's Connecticut sites, where it produces engines for the F-35 and about 70% of the company's geared turbofan engine, which is used in European planemaker Airbus' AIR.PA strong-selling A320 neo family.

(Reporting by Dan Catchpole in SeattleEditing by Nick Zieminski)

((dan.catchpole@thomsonreuters.com; 651-231-1623))