Airbus has released images which show Delta Air Lines' first A220-100 rolling out of the paint hangar at the final assembly line in Mirabel, Canada.
Delta will be the first US airline to take delivery of an A220.
The initial aircraft, bearing Delta's livery, is now moving to pre-flight activities in Mirabel's A220 flight-line hangar, says Airbus.
It adds that the jet's maiden flight will follow "later this fall".
Atlanta-based Delta is set to put its first A220 into service in early 2019.
Flight Fleets Analyzer shows that that eight A220-100s – known as Bombardier CS100s before Airbus took control of the CSeries programme – are in service with Swiss.
The Lufthansa subsidiary also operates 16 A220-300s – formerly CS300s. Eleven aircraft of that variant are in service with Air Baltic, and seven with Korean Air.