Just as an aside, no-one planning actual ETOPS routes would ever use IATA airport codes. IATA codes are to ICAO as NetBIOS names are to DNS. I wish we could s

Just as an aside, no-one planning actual ETOPS routes would ever use IATA airport codes. IATA codes are to ICAO as NetBIOS names are to DNS. I wish we could stamp-out the casual use of IATA codes, they do have some internal admin uses within airlines but they only cover a subset of airports and they don't have any logical decoding sequence.