Help please. Why should 17d be ALERION? Old flyer proficient without a disturbance
13d.Office Manager?(5,5) David ???N?
23a.Opposed to saint leaving once more(5) is this simply AGAIN
22a.Even freak pet is fascinated(4)
19d.Make pile after salesman's initial patter(5) ???E?
An alerion is a mythical eagle http://bestiary.ca/beasts/beast4798.htm
An aileron is a flap on a plane to keep it stable (undisturbed)
Could this help with your answer for 17d?