One of the essential problems is to verify, whether the aircraft is within the non-ETOPS (60min OEI cruising speed, usually around 400 kts TAS = 400 NM) or not. One of the easier examples is a flight from Europe to Cabo Verde, which usually needs to overfly GDV VOR to join UN873. Otherwise, like seen above, the aircraft would be ETOPS between LPA and BVC for a short time.
Working with Jeppesen Jetplanner and LIDO Flight Planning, I was simply able to determine airports in a list (GVBA; GCLPA) which where shown with their correct 60min range rings on the map, so I could determine whether to use ETOPS or not.
Jeppesen, for example, simply had a tool, where I could insert infinite airports, which were shown as adequate Aerodromes along my routing for planing reasons.
The new flight planning solution Flightkeys 5D shows this requirement pretty good:
Regarding 60min range, this is a function of One-Engine-Inoperative Crusing Speed (TAS) x 60min = Distance in NM. Usually variying between 380 to 425 NM which I was dispatching, basically B738, A320FAM, B757, B767, B787 and A300.
I am not a friend indeed of automated functions to find adequate Aerodromes, I would therefore be happy with a function like currently seen in your ETOPS list by a) finding it automated or b) applying your own list.
This would be extremly helpful by finding suitable ETOPS En-Route Alternate Aerodromes while planning e.g. across the NAT HLA sector and would be a great tool for training.
One more info: Adequate Aerodromes are not checked against their weather, which means there is no “suitability” check. Hence, no weather check is required. Only the 3% Fuel En-Route (ERA) Alternate plus ETOPS En-Route Alternates, Destination Aerodrome (DEST) and Alternate Aerodrome (ALTN) are checked for this case.
Finally, a dynamic function like clicking on an aerodrome via right-hand click and “select Adequate Aerodrome”, showing the 60min Range, would be highly appreciated and extremly dynamic and responsive as well!