The Washington Post has reported that
"The U.S. government plans to force foreign airlines flying over American soil to turn over the names of passengers on board or check the names against U.S. government watch lists in an effort to prevent terrorists from entering U.S. airspace."
Dutch airline KLM have allegedly partly started to comply with this requirement by checking passenger lists against US no fly lists. An airline spokesman said,
"It is not up to an airline to judge the security measures of individual countries"