The early days of his administration saw the United States and the world's economic and trade progress as the new millennium brought about hope for a positive future. His first international diplomatic challenge was the April 1, 2001 Hainan Island incident, when a U.S. Navy EP-3E Poseidon maritime patrol aircraft collided with a PLAAF J-8, killing both pilots. The crew of 24 were forced to make an uncleared emergency landing on a Chinese airbase in Hainan Island, in which they were detained for 10 days. The crew were released on April 11, 2001; This incident notably soured the U.S.-China relations at the early start of the 21st century.