United Airlines entered into an agreement to purchase 20 used midlife A319s with expected delivery dates scheduled in 2020 and 2021.
Previous reports suggested the aircraft could be sourced from easyJet, although it is not confirmed as the seller asked United not to be disclosed.
In the 1Q 2018, United took delivery of six new aircraft, four B787-9s and two B777-300ERs. The carrier's latest aircraft, the first of six B737 MAX 9, to be introduced in domestic flight schedules starting in June.
The airline is pursuing additional used aircraft transactions for both widebody and narrowbody aircraft.
As such, the mainline fleet is expected to grow in 2019 and 2020, as aircraft come off lease and as new and used enter aircraft enter United's fleet.