Delta Air Lines may issue a request for proposals in August or September as it weighs 74 orders for either Airbus A320neo or Boeing 737 Max jets, plus an extra 75 options on more planes.

The multi-billion dollar order would be a big win for Boeing and its 737 plant in Renton, where 10,000 workers build the jetmaker’s best-selling new 737 Max jets.

Scott Hamilton, the Bainbridge Island aerospace observer and Leeham News publisher, has said he thinks Boeing (NYSE: BA) wants Delta (NYSE: DAL) to be…