Popay, you’ve obviously done some deep reading on this issue. It still leaves the pilots to address the following:
1. reference 3.6.2.3 mentions “requests for flight plan changes” However turning 90 or 180 degrees at a FIR boundary, as most recommend, is contrary to the flight plan, and any ICAO procedures that have been found.
2. While you mention “agreement between atc units” on the subject of coordination of flight plans, there seems to be no “agreement between atc units” on how to handle entry refusals.
3. It would be interesting to know if the International Procedures departments of major airlines have put anything in writing to their crews on how to deal with this entry refusal. Or in fact if ICAO provides any contingency procedures.
Hawk