Hi folks,
I made a test to see how air strike works. I created a little scenario with merchant convoy (8 ships) 150km West from Brest. I put around Brest four bombers and fighters air bases.
7.00am: upon my watches saw ships, I sent the radio message. I remind you the call is good ending when you can see your message sent in the radio log. Otherwise, you can't have air cover.
7.32am: radar warning receiver adviced me radar signals... RAF incoming!
7.47am: Lufthwaffe attacks convoy!
8.30am: an other Lufthwaffe raid!
After 9.00: all quiet....
At 9:36 my sonarman advices me WARSHIPS incoming!
But..

I didn't put any warships in the scenario! At free camera sight I saw this:
german warships!
s-boat, DD, DD, DD, s-boat.
So... it seems when the air cover request is accepted.. BdU sends also warships!!
this is pretty new for me..