Airlines without ICAO/IATA codes

[Phil1122]

Is it possible to submit an “airline” to the database if the fleet operator does not have an ICAO or IATA code assigned? In the US there are many commercial air ambulance services that operate without a code. I was wondering if it was possible to organize some of these aircraft into fleets the same way other commercial airlines are in the FR24 database.

[Mike]

ICAO code is required. IATA is optional.