MOFFETT FIELD, California (AP) -- An unprecedented national survey of pilots by the U.S. government has found that safety problems like near collisions and runway interference occur far more frequently than previously recognized. But the government is withholding the information, fearful it would upset air travelers and hurt airline profits.

"NASA should focus on how we can provide information to the public, not on how we can withhold it," NASA Administrator Michael Griffin said in a statement. He said the agency's research and data "should be widely available and subject to review and scrutiny."