Already been done.
November 2003 (I think) DHL Airbus hit by shoulder launched SAM. Crew did a great job getting the aircraft on the ground with half the port wing missing.
March 1994 IRA launched a mortar attack on Heathrow from the car park of the Excelsior Hotel, fired them right over the LHR Police station! this resulted in patrols taking place on a regular basis around most UK airports in order to establish an extended perimeter.
I remember visiting the Excelsior Hotel a few days after the incident and the 'launch vehicle' was still there surrounded by a load of burnt out cars caught in the blast from the homemade mortar tubes.