Just out of curiosity, is there any benefit to getting the card? Is there some sort of achievement, or unlock with them?

That is not a true barrel roll.

A true barrel roll has you pulling back on the stick and then performing a roll while still pulling back on the stick all the way through. This will shake their fire a little.

check the encyclopedia, all the moves needed are there located under stunts.
Maybe you also need to do the hide in the clouds thing?

I've got the trophy already btw...

did you do the flat spin correctly? normally the game tells you to steer along with the roll with ailerons and against the roll with rudder, but the encyclopedia tells you to leave the ailerons alone and solely use the rudder...

That's my thought. It looked like an aileron roll to me too, but they gave me credit.

I can't seem to get the immelman or the split S credit though. Wonder what I'm doing wrong? For the split S, I flip over, and then pull er back until I've come around the bottom, yet I don't get the credit. There really can't be more to it than that.

It has to be pretty precise to get the immelman and split S. Try not to use the rudder.

I will try again tonight. I heard you have to do them all in the same session. I will see if I can knock them all out in training.

I did them all in one session anyway...

So did I - all stunts in ONE training mission. And only by doing Immelmanns, Split S's, Barrel rolls and Inside Loops. No spins and/or cloud hiding. It took more than one of each stunts though. More like 5 Immelmanns, 10 Barrel rolls, 3 loops and a couple of Split-S's...

NOTE: I know that the way I explained the Barrel roll isn't the real way of doing it. But this is a game and it seems as if the key to nailing a stunt is having the wings 100% horisontal before, during and right after you do it. I noted this during Split S practice. Tilt the wings just a tiny bit and you won't see the Ace of Spades.

Well I did one each and got all of the cards but no trophy. I don't see why you had to do more than one to get the trophy.

Well it was the same for me. I kept getting the cards but no Achievement (im playing the 360 version) which got me angry and into some sort of Aerobatic Berserker Mode or something - flying around like crazy, with almost a whole deck of Ace of Spades on screen. And all of a sudden the Achievement appeared... A bug maybe?