ATLANTA — More shuttle buses to and from the new international terminal are being considered after complaints from passengers, said officials at the world’s busiest airport in Atlanta.

Craig Kimbrough of Atlanta says he waited in line for a shuttle bus for about 45 minutes last week after returning from a flight from Dubai. The shuttles take passengers from the international terminal to their cars or the airport MARTA station.

“It just seemed like an overly onerous process,” said Tom Cooney, of Dunwoody, who waited in line for a shuttle for about 25 minutes when he arrived from London on Saturday.

Passengers complain the shuttles are too small, and there aren’t enough of them, The Atlanta Journal-Constitution reported.

The airport has 14 international terminal shuttles and is considering adding more from its park-and-ride shuttle fleet, said Louis Miller, the airport’s general manager.

The new $1.4 billion international terminal opened this month at Hartsfield-Jackson Atlanta International Airport.

Some early problems involve travelers who parked at the main terminal before the international terminal opened and now are returning to find that they must ride a shuttle to get back to their cars in the main terminal decks, Miller said. Shuttles have already been added, and lines are going down, he said.

“We’ll do whatever it takes to work more efficiently,” Miller said.