Delta Air Lines is set to update the cabins of its Boeing 757 and Airbus A350 jets.The 757s being updated are at least 20 years old as Delta waits on delayed new 737 jets.New cabins feature memory foam cushions in economy plus a refreshed business class. Sign up to get the inside scoop on today’s biggest stories in markets, tech, and business — delivered daily. Read preview Thanks for signing up! Go to newsletter preferences Thanks for signing up! Access your favorite topics in a personalized feed ...