Err... trying this will most likely get you the undivided attention of a few gentlemen in F16s
You are confusing FP with CAS. The FP requirements vary from country to country and can be found in the AIP. In the US, other than when crossing an ADIZ, a VFR FP is not mandatory (I'd need to check for possible recent changes, don't have time now). However, you DO need radio contact when flying in CAS in the US.
To sum it up: in the US, you can happily fly in CAS without a FP, but you do need to talk to someone.
In any case, this thread was about Spain, no
