International Lease Finance - the world's biggest aircraft leasing firm - has ordered new planes from US manufacturer Boeing in a deal worth $1.2 billion (£659.3 million).
ILFC said it was converting options into orders for six 737-800, two 777-300ER and two 787 Dreamliners.
Delivery of the 737s and 777s were scheduled to start in the first quarter of 2009 and the 787s were expected in early 2012, Boeing said at the Farnborough Air Show.
ILFC is the aircraft leasing arm of insurance giant American International Group.
Steven Udvar-Hazy, influential ILFC chief executive who earlier this year criticised rival Airbus' original A350 design, said the purchase underlined his company's commitment to Boeing.
Mr Udvar-Hazy said Airbus had taken "a step in the right direction" by redesigning the A350, but said important details needed working out.
He added AIG had no plans to cancel orders for the A350 or the A380 superjumbo.
ILFC has now ordered 706 Boeing jets since 1977 and in that time, has placed Boeing 777s, 737s, 747s, 757s and 767s with airlines around the world.
Including ILFC, 25 customers have made 362 orders for the 787 since its April 2004 launch. Boeing says the Dreamliner will use 20 per cent less fuel than comparable planes.
New Indian cargo airline Flyington Freighters, meanwhile, said it had agreed to buy four Boeing 777F cargo planes in a deal worth almost $1 billion.
The two deals take Boeing's tally at the air show to almost $10 billion. Airbus has only announced deals worth about a quarter of that sum.