The world's largest airliner, the Airbus A380 superjumbo, was officially declared safe to fly commercial services on Tuesday, capping six years of development marred by delays in deliveries to airlines.

The European Aviation Safety Agency (EASA) and U.S. Federal Aviation Administration (FAA) gave their approval in an unusual joint ceremony at the planemaker's French headquarters.

"It's a great day for aviation ... The size of this aircraft is indicative of just how big dreams can be," FAA Administrator Marion Blakey said as the agencies granted safety certificates.

With its brand-new paperwork, the 555-seat, double-decker aircraft comes of age as a mammoth addition to the world's airliner fleet despite production delays hampering deliveries.

The discovery of wiring installation problems in Europe's biggest industrial project plunged Airbus parent EADS into financial and management turmoil over the summer, slicing a quarter off the Franco-German aerospace group's market value.

EADS continued to be haunted by the crisis on Tuesday when French police raided its offices and those of shareholder Lagardere in a probe into alleged insider dealing.

The insider share trading probe was launched after complaints that top managers sold shares shortly before the production problems were discovered. All have denied wrongdoing.

Airbus Chief Executive Louis Gallois, who arrived late for the A380 ceremony, declined to comment on the police search at his offices in Paris but was clearly irritated by its timing.

"The search was expected but we didn't know which day. Why today? The police officers told me it was a coincidence. Well I'd like to thank them for the coincidence," he told reporters.

Although the aircraft has passed months of flight tests in extreme conditions and impressed aviation enthusiasts the world over, successive delays and profit warnings mean deliveries are now on average two years behind schedule.

The plane is now due to enter service with Singapore Airlines in October 2007 instead of this month.

Angry airlines want penalties to be paid by Airbus. Some had launched a marketing blitz connected to the new plane, which is designed to offer facilities that can be customised for each airline.

U.S. parcel service FedEx became the first A380 customer to cancel an order last month, switching from the freight version of the plane to Boeing's 777.

Thai Airways International said earlier this month that it would cancel its order for six A380s if talks on compensation for delayed delivery failed.

149 SOLD

Airbus has sold a total of 149 A380s after deducting the 10 originally ordered by FedEx.

The aircraft was conceived as the A3XX in 1997 and the project was formally launched as the A380 in December 2000.

Industry sources say it cost an estimated 12 billion euros ($16 billion) to develop the plane, which aims to dethrone Boeing's 747 jumbo as the king of the skies.

But critics say Airbus bet on the wrong plane as Boeing turned its back on the ultra-large market to focus on building a mid-sized twinjet for long-haul travel -- the fuel-efficient 787 Dreamliner, which has already sold more than 450 times.

After a false start and doubts over funding, Airbus hit back with the development launch of a rival aircraft, the A350 XWB.

That plane will cost another 10 billion euros to develop and will enter service in 2013, five years behind the 787.

Yet Airbus insists it was right to build the A380, due to rising passenger numbers and pressures on airport capacity. It predicts a market for 1,600 such plans over 20 years.

The FedEx order cancellation, coupled with a decision by U.S. lessor ILFC to switch freighters to the passenger version, has left question marks over the viability of the freighter version of the A380. UPS, which is now the only freight customer, has said it is considering its options.

Airbus sales chief John Leahy said last week Airbus would build the freighter if UPS wanted it.

EADS co-Chief Executive Tom Enders said there was no need to scrap the super-freighter and there was demand for 500 cargo planes of that size in the next 20 years.