Geneva airport on Monday inaugurated a new terminal building, the first part of a SFr250 million ($248.5 million) expansion and revamp.
The terminal, which took three years to construct, has added 40 per cent more room to the airport.
No taxpayer money had been used to fund the project, Transport Minister Moritz Leuenberger said at Monday's ceremony.
"This is the most important work undertaken by the airport in 40 years," said François Longchamp, a Geneva senator.
Other projects are now scheduled to begin. A new, 850-metre-long wing to welcome long-haul passengers should break ground early in 2010.
Nearly 11.53 million passengers used Geneva airport in 2008, making it Switzerland's second-busiest.
Zurich remains the country's most frequently used airport, with more than 22 million passengers flying in or out of Switzerland's largest city in 2008.
swissinfo.ch and agencies