The world's largest airline had agreed in September to a tentative contract that was put to vote with the members of Communications Workers of America and the International Brotherhood of Teamsters (CWA-IBT), which jointly represent nearly 15,000 workers.

"Immediately an average of 30 percent in increases takes effect," IBT spokeswoman Kara Deniz said in an emailed statement to Reuters.

CWA spokeswoman Candice Johnson said workers will get two wage increases per year.

"It's a contract that provides especially for the lower-wage workers," Johnson told Reuters. "It's life changing, especially, say for home-based agents."

CWA said 73 percent of CWA-IBT members voted in favor of the deal.

The Fort Worth, Texas-based carrier, formed by the merger of American Airlines and US Airways in 2013, is aiming for a smooth integration of its workforce and has already concluded contracts with its pilots and flight attendants.

American Airlines' shares closed down about 1 percent at $41.26 on Monday. The stock was little changed in extended trading.

(Reporting by Abhirup Roy in Bengaluru; Editing by Siddharth Cavale and Anil D'Silva)

By Abhirup Roy