Such patterns could give clues to problems in air traffic control or other aviation systems.

"The general idea is to improve the safety of the whole international aviation system," an agency official said.

The Government agrees to build and maintain a safe aviation system.

"As Federal taxpayers, we support a national aviation system," he said.

Russia's aviation system appears to be well prepared, according to American officials.

"The events of this last weekend show that the aviation system is under some strain."

Somewhat better off were the nation's aviation system and water resources, according to the study.

This was a big step forward for Bonaire and its aviation system.

I think it is important to address the performance and sustainability of the aviation system.

"That is not a good way to run a national aviation system."