Delta Air Lines has agreed to buy 40 new Boeing 737-900ERs and 20 used Embraer E-190s, subject to ratification by Delta’s pilots of a tentative labor contract.

The Delta Master Executive Council (MEC) of the Air Line Pilots Association (ALPA) endorsed the tentative labor deal Wednesday, sending it to rank-and-file flight deck crew for a ratification vote. Delta said the new labor deal enables it to place the order for 60 aircraft, which includes 20 E-190s previously operated by another carrier and owned by Boeing. The E-190s, configured with 98 seats, will be flown in the airline’s mainline network, Delta CEO Richard Anderson said.

“The E-190 will be deployed on US domestic routes to improve the flying experience for Delta customers and continue the shift of flying away from inefficient 50-seat regional jets as part of the company's successful upgauging strategy,” Delta said in a statement. The E-190s are slated to enter mainline Delta service in the 2016 fourth quarter.

The 40 new 737-900ERs are in addition to 100 of the type already ordered by Delta. The aircraft will enter Delta’s fleet through 2019, replacing older narrowbodies.

Delta said the new pilot labor contract includes base pay increases for flight deck crew and provides “additional career advancement opportunities for Delta pilots.”