The same kind of thermal and sound insulation implicated in fires on at least four other jetliners was used on Swissair Flight 111, which crashed Sept. 2, the airline confirmed Thursday.

The thermal insulation blankets - similar in appearance to home insulation - are approved by the Federal Aviation Administration.But McDonnell Douglas Corp., manufacturer of the Swissair MD-11 that crashed off Nova Scotia's coast, recommended last year that the insulation be replaced with a more-fire-retardant variety at "the earliest possible maintenance period.

All 229 people aboard the flight from New York to Geneva were killed in the crash of Flight 111.