A late strike from Stephen Murray ensured Partick Thistle's progress in the CIS Insurance Cup.
The Jags dominated the first half and led thanks to a stunning shot from defender Gary Harkins.
However, the visitors forced their way back into the game and a powerful header from Steven McKenna restored parity on the hour.
With just two minutes remaining, Murray ran on to a clever step over from Mark Roberts and smashed the ball home.
Partick Thistle: Tuffey, Storey, Twaddle, Chaplain (Donnelly 50), Harkins, Archibald, Connor (Strachan 62), Rowson, Buchanan (McStay 45), Roberts, Murray. Subs Not Used: Hinchcliffe, Lennon.
Goals: Harkins 14, Murray 88.
Airdrie Utd: Robertson, McKenna, Lovering (Sharp 87), Smith, Smyth, McDonald, McDougall, McKeown, Russell, Holmes, Waddle (Noble 76). Subs Not Used: Gillies, Watt, Morrison.
Goal: McKenna 61.
Ref: C Richmond