OK tried and tested! Works on dedicated. Here is an example of my scans.
Time on the left is my time, time on the right is in game time. X means no enemy in range. D means I was using Dover radar and R means Rye.
So in the test mission use Dover. Dont forget you also need tail number 1 which appears as an A.
00:18 D X Mission Start +/- 2 mins
00:23 D X
00:25 D X
00:26 R X
00:27 R X
00:28 D X
00:30 D X 1100 IN GAME TIME
00:30 R X
00:31 R X
00:31 R X
00:32 D X
00:33 R X
00:33 D X
00:34 D X
00:35 D

11:05 IN GAME TIME
10+ Enemy, 12 miles South West of Calais, Angels 11, Heading 300
10+ Enemy, 13 miles South West of Calais, Angels 11, Heading 300
00:36 D

11:06 IN GAME TIME
10+ Enemy, 17 miles
South West of Calais, Angels 11, Heading 300
10+ Enemy, 18 miles
South West of Calais, Angels 11, Heading 300
00:38 D

10+ Enemy, 17 miles
West of Calais, Angels 11, Heading 300
10+ Enemy, 18 miles
West of Calais, Angels 11, Heading 300
There were some more after this but I took off in my hurricane to have some fun. By the time I was airbourne and underway they were within 20-30kms of Folkstone which also came as a message in the chat. So obviously just like real life you need to be up before hand. I could not climb in time to intercept. Howver these are not spawning in on TTIME, just at the beginning of the map, so they get to target in about 40 mins(?).
Also notice the double report which is interesting.
Right now we are positive this works we have added the stats part and left the radar timimngs on the supa dupa test settings, its running in a loop on Storm of war campaigns, so check it out and give us a hand testing it. also get familar with it. DONT press 0 cause it was not letting me go back in the menu afterwards...