Airdrie moved to the top of the table after an away victory at Livingston.
Second-half goals from John Boyle and Jamie Bain secured the three points.
Jack Boyle tested the reflexes of Livingston goalkeeper Andrew McNeil two minutes after half-time.
However, after the resulting corner was cleared, Nathan Blockley returned the ball into the penalty area and John Boyle pounced to fire past the keeper from six yards.
McNeil made another good save after 68 minutes, tipping Paul Di Giacomo's effort from the edge of the area away for a corner.
But Bain found a way past the keeper two minutes later, collecting Di Giacomo's knock-down and coolly fired into the bottom-right of McNeil's goal.
Livingston: McNeil, McCann, Watson, Craig Barr, Fordyce (McDonald 73), Robert Barr, Ross Docherty (Mullen 74), Scougall, Andreu, Iain Russell, McNulty.
Subs Not Used: Jamieson, Downie, Andrew Russell.
Airdrie Utd: Arthur, Hart, MacDonald, Lilley, Warren, Bain, Lynch, Blockley, Cook (Griffin 57), Jack Boyle (Di Giacomo 67), John Boyle (Barclay 63).
Subs Not Used: Duncan, McKenna.
Booked: Blockley, Bain, Lynch.
Goals: John Boyle 48, Bain 70.
Ref: Mike Tumilty