Officials from the State Department and the Pentagon say some transport planes are already on the ground and others are en route to the area affected by South Asia's killer tsunami.
Officials say millions of dollars in humanitarian aid supplies are now in Indonesia and Thailand. The supplies include three-thousand tons of rice and enough plastic sheeting to shelter 10,000 people.
The director of the U.S. Agency for International Development, Andrew Natsios, rejects a description of aid from western nations, including the U.S., as "stingy."
Natsios says the U.S. donated nearly $2.5 billion in humanitarian aid last year, 40 percent of the world's total aid.
Some critics have faulted the U.S. for responding slowly to the disaster but a top State Department official says nothing could be further from the truth. He says U.S. aid started flowing Sunday.