I am a surgeon and have been called 5 times to respond to medical situations while in flight. I can tell you resources are limited. One guy passed out twice before we pushed back and then was ticked off when I told the pilot he should not fly. Also three times Delta has made me fill out tons of paper work after?? Another time I was patched through to the Mayo Clinic to help with a guy having difficulty breathing. It is difficult at best to deal with these problems in the air.