Imams, ministers and a rabbi staged a pray-in yesterday at Reagan National Airport and demanded an apology from US Airways for barring six Muslim clerics from a Minneapolis-to-Phoenix flight last week. The religious leaders called for an end to racial profiling, saying it was unacceptable in the United States... US Airways spokeswoman Andrea Rader said prayer was never the issue... She...said the men got up and moved around the airplane, so the flight crew consulted with the airline about whether they might pose a security risk. Local law enforcement and the FBI thought they did, she said. "We're sorry the imams had a difficult time, but we do think the crews have to make these calls, and we think they made the right one," she said... [also refers to post-11 Sep. govt. investigations of discrimination by American Airlines, United Airlines, Delta Air Lines, Continental Airlines]