Yep sling you just about summed it up. Sling you will find that if you are in the training arena and someone "WANTS" to engage you, they will check 6 you. You then (hopefully) will give you the chance to say
"Yes I want to fight you"
or
"No DON'T shoot me"
But if you hear check 6 in the Main Arena or in H2H then it usualy means that you have to move your bellybutton pretty fast
If I was you I really would not worry to much about the Perk Planes. To be honest the perk planes are only really any use to people who know how to fly them properly. Apart from maybe the temp and the Ar234.
Ar234= German Jet Bomber
Tempist = British Fighter/Bomber
F4U1D (Chog)= US Carrier Based Fighter/Bomber
TA152 = German Figher
Hope this has been of help