In September 2013, Mesa Airlines announced an agreement with United Airlines which extends the operation of 20 CRJ700s through 2020. The agreement includes an order of 30 United-owned Embraer ERJ-175s that will be operated under contract by Mesa Airlines. Mesa Airlines later announced an agreement with United Airlines to add 18 Embraer 175 aircraft to Mesa's United Express fleet. Mesa will operate 48 Embraer aircraft for United Airlines. In October, the Company announced an agreement for the addition of 15 new aircraft scheduled for delivery in 2016, which has now increased to 18. Mesa currently operates 76 E175 aircraft and 20 Bombardier CRJ700 aircraft under the United Express brand .