Northwest Airlines is offering condolences to the family and colleagues of a Northwest airline pilot who died last night en route from Los Angeles to the Twin Cities. Thomas Christianson died of an apparent heart attack. Back-up pilots landed the plane without incident. As airline traffic has increased, so has the number of in-flight medical emergencies. Federal Aviation Administration figures indicate that more than 100 people die on airplanes each year. The agency is considering a proposal to require airplanes to be equiped with Automated External Defibrilators or A-E-D's, which deliver a shock to heart attack victims to help restore normal heart activity. Joan Sullivan Garrett is President of Medaire Inc, a Phoenix-based company that offers in-flight medical advice to commercial airlines. She says the major comercial airlines aren't waiting for the F-A-A to require the upgrade: