Passenger boarding without flight crew - what does your airline do ? ....

[luvly jubbly]

I can't see any problem with this..... Obviously they would have confirmed that flight crew are indeed on their way to the aircraft. Flight crew only need to be there to fire the APU extinguisher!

If the APU is off, and there's no fuelling then what's the problem? CC are trained to initiate evecuation should something unforseen occur....