Wasn't there a "Wargames" multi a while back? To be honest, I don't know how it turned out as I was at work at the time, but ask Clipper, Cspyro or Tweek.
there was a Wargames a while back, and although in fs9 you can't shoot someone down, what was done was we had to stay behind somone from approx 0.1nm away for at least 5-10 seconds to register a kill, baring in mind this was done with spitfires and 109's etc was quite good fun,.
If its a Jet version of the Wargames that was had i would see it quite hard to actually do as most jets are capable of atleast 300-400mph and can be a right pain to achieve a "simulated lock on" while basically formation flying for so long.
as BAW0343 mentioned, try Lock on or C.F.S for these type of things.
Nemo...................