Twenty airlines will move into the third terminal (T3) of the Beijing Capital International Airport next Wednesday, shifting 60 percent of the airport's handling capacity to the new building.

Insiders said it would be a real test of the world's largest terminal.

The airport yesterday said at a press conference that T3 has been operating smoothly since the first batch of six carriers moved in on Feb 29.

Since then, it has handled about 40 flights and 5,000 passengers daily.

"There were some trivial problems, but they didn't affect passengers or the terminal's overall operation," deputy general manager of the Capital Airport Holding Co Dong Zhiyi said.

"Passenger feedback indicated the signage in T3 needed improvement," he said.

"We have made efforts to improve this and also carried out emergency drills to prepare for malfunctions of the automatic people mover system and the luggage system," he said.

But the biggest headache for the airport is the daily average of 300 passengers who go to the wrong terminal building.

Huang Gang, who is in charge of T3's management, said a survey conducted between Feb 29 and March 16 showed 7,112 passengers took the free shuttle buses that carry passengers among the three terminals.

It also found 1,089 passengers ended up in the wrong terminal and got on the shuttle buses on T3's opening day. The number has since declined steadily, reaching 323 by March 16.

Analysis of the reasons people end up in the wrong terminals found 26 percent of passengers weren't given sufficient information by carriers, 19 percent were given incorrect information by carriers and 17 percent didn't know airlines were moving to T3.