I edit the Airlines table to cater for local variations. This is especially important for aircraft using IATA codes, which are not unique - in some parts of the world an IATA code will relate to one airline, in another part of the world it will relate to a different one.
Also some organisations use "wrong" codes - for example the Australian Royal Flying Doctor Service (RFDS) often uses FD codes, which officially belong to Thai Air Asia, who consistently use AIQ, so I've created a dummy ICAO code for the RFDS so that FD codes show the RFDS logo.
Users need to be able to edit the table to choose the logo they think is more important to them.
Other than that, I only edit the Aircraft table to correct aircraft ICAO type codes which the server gets wrong - usually with ... replacing the proper code - today I corrected just one, a PA31. Assuming that the server routine is corrected someday, I won't need to do that.
HTH
Rod