United Parcel Service signed an agreement with Airbus that changes the delivery dates for UPS's order for the freighter version of Airbus' A380.
The revised agreement also provides for either company to cancel its order later this year.
Losing UPS would be a significant blow for Airbus as the Atlanta package-delivery company has the last remaining order for the A380 superjumbo freighter.
UPS, the world's largest package delivery company, has been rethinking its order for 10 A380 freighters since October, when Airbus announced a third delay on the giant plane due to wiring problems, putting it two years behind schedule.
UPS's planes were originally scheduled for delivery between 2009 and 2012. The company did not say what new delivery dates it had agreed upon.
UPS rival FedEx and International Lease Finance, a unit of American International Group have already canceled their orders.
Airbus is owned by European aerospace company EADS.