The suspected bombing of a Russian airliner over Egypt is raising concerns about security loopholes in the U.S., where the vast majority of the almost 1 million employees at airports aren¡¯t subject to searches like those that travelers receive.

Intelligence reports that an airport worker may have been responsible for planting an explosive device on a Metrojet Airbus A321, which broke apart and crashed on Oct. 31, are a sobering reminder that terrorist groups might try to do the same thing here, said Rep. John Katko, a New York Republican who is chairman of the House¡¯s transportation security subcommittee.

¡°I do think that the Metrojet incident has really pointed up the seriousness of looking at the insider threat at airports, both domestically and internationally,¡± Katko said. ¡°It¡¯s become a much more urgent matter since the Metrojet bombing.¡±