at an international airport
-you would get every attention when you startup the engines without any startup clearance and with no flightplan of this aircraft in the system
- you would surely trigger a full blown alert when you start to taxi an aircraft without radio communication to ground , without startup and taxi clearance and without any flightplan issued .
i,m wondering how he made it to takeoff position on the runway ??? i would expect you would be blocked with e.g a fire truck to reach the runway in such a case