|Sons battling it out at the Excelsior|
Jordan Halsman gave Sons the lead on 16 minutes, with a sweetly struck free-kick from the edge of the area. While the Diamonds often dominated possession, Dumbarton clung on until the break.
But then in the second half things began to fall apart. Goals from Scott Sally (76 minutes) and Scott Morton (81 minutes), both arising from defensive frailties as Airdrie piled on the pressure, cost Sons the game.
Dumbarton now face a tough season run-in, still needing points (or slip ups from rivals) to be sure of avoiding the relegation play-offs.