Start Clearance?
ATC guys, I have a question for you.....What is the actual purpose of calling ATC for a start clearance? Politeness? Common courtesy? Where can I find the rules and regs for it?
I hear fixed wing and helos ask for it when thay are both flying under VFR and IFR and at airports within controlled airspace and at aerodromes with just an ATZ???
Anyone enlighten me?
Many thanks,
Fatigue.