Open airbase ini file for example GERMAN_AIRBASE1.ini & copy this in front of TaxiHead values:
//Runway1
[Runway001]
Heading=0
Offset=0,0
Length=2500
Width=90
TouchDownHead=0,918.5
TouchDownTail=0,-918.5
;TakeOffHead=0,1300
;TakeOffTail=0,-1300
LaunchAll=TRUE
TakeOff[01]=15,-1100
TakeOff[02]=-15,-1100
TakeOff[03]=15,-1130
TakeOff[04]=-15,-1130
TakeOff[05]=15,-1160
TakeOff[06]=-15,-1160
TakeOff[07]=15,-1190
TakeOff[08]=-15,-1190
TakeOff[09]=15,-1220
TakeOff[10]=-15,-1220
TakeOff[11]=15,1250
TakeOff[12]=-15,-1250
TakeOff[13]=15,-1280
TakeOff[14]=-15,-1280
TakeOff[15]=15,-1310
TakeOff[16]=-15,-1310
TaxiHead[01].......................
It's for max 16 a/c and not big ones like bombers. Be awared that after permission to take off all a/c will move on in short periods.