Middle Eastern carrier Etihad Airways appears to be the carrier behind cancellation of four Boeing 787s.
Etihad Airways ordered 35 787s in March 2008, part of an extensive agreement for Boeing and Airbus jets.
But Boeing's order data, which disclosed last month that four 787s had been dropped from its order books, records only 31 787s against Etihad.
Etihad could not immediately be reached to confirm any cancellation.
While Boeing does not list an engine selection against the remaining twinjets, sources familiar with the agreement stated in 2009 that Etihad had opted for the General Electric GEnx powerplant.
The Abu Dhabi-based carrier had selected the 787-9 variant in an agreement that also covered 35 options and purchase rights for 787s.
Etihad also ordered 10 777s as part of the same package, as well as 55 Airbus jets.