Ossan's Love: In the Sky

Haruta, a 35-years-old single man, has to switch career and begins as a CA in Tenku Peach Airlines. Even though he's clumsy, he seems to be protected by the Great Captain Kurosawa. One day, he finds drawings of himself on a locker and accidentally discovers his Captain is secretly in love with him. At the same time, the co-pilot and a mechanic, who sleeps next door, confess to him too. (Source: carlosb at MyDramList)