THE YEAR WAS
"To Sneak A Bomb Onboard"
Written by S. R. Powell(writer and artist)
Mystery Men Comics #10 - D-13 is flying to investigate a series of ship sabotages when he notices two known foreign agents on the plane. They are part of a team that sneaks bombs onto ships after they leave harbor and D-13 is determined to trap them.
Here are the pages I have of it.