3 letter International code

i find it frustrating to have to look up the codes for international cities on differnet sites. Maybe we could have a system where one could enter a three letter intl code (NRT) which is more common, and then be shown the 4 letter code? Wat do yall think?

It’s more common for the flight plans to be filed with the ICAO code rather than the IATA code.

What’s so difficult about keeping a tab or window open with the ICAO/IATA cross reference?