Delta Air Lines operates a mixed fleet, with a slight lean towards Boeing at 53.4%, according to ch-aviation data. But it's Boeing fleet is growing, and the carrier is awaiting a significant order of 100 737 MAX 10 – the largest of the Boeing narrowbody family. CEO Ed Bastian has made clear his confidence in Boeing, despite the recent Alaska Airlines’ Flight 1282 incident with a 737 9 MAX door plug.