Votes in favor could land the Atlanta-based airline a new contract as early as half a year before it can officially become amended on Dec. 31, 2015. That would contrast with union deals at other U.S. airlines that took multiple years to reach.
The letter did not disclose details of the tentative contract. However, it is expected that wages will rise after pilots at competitor American Airlines Group Inc <AAL.O> approved a contract with a 23-percent wage hike in January.
"This agreement represents the culmination of tremendous effort on your behalf," Delta MEC Chairman Mike Donatelli said in the letter, noting that preparation and talks for the new deal had taken a year.
The airline could not immediately be reached for comment.
(Reporting By Jeffrey Dastin in Los Angeles; Editing by Prateek Chatterjee)