Kizuna: Hand of God Unbound by The Heavens

(from ebookjapan):

Part-time doctor, Takeshi Busujima, returning from the U.S.A. --!

His technique is causing a storm of innovation in the Japanese medical community! A passenger suddenly collapses on an airplane during a flight. A well-known doctor on board the plane refused to treat him, saying, "There is nothing we can do here."

However, another doctor, Takeshi Busujima, who was also on board, begins to operate on him, even though he is not well equipped to do so!