Does anyone know how to change the aircraft registration? I've looked everywhere and can't find it. I presume I entered it when I first created the entry. 

In LNM aircraft performance profile? Menu -> "Aircraft" -> "Edit Aircraft Performance" -> tab "Aircraft" -> field "Aircraft type".

Alex

Shouldn't there be the type? For Example A321?

I have the same problem with X-Plane. LNM uses always a wrong registration. Which i cant find in the performance Tab. If i look into the performance file itself, there is also now Reg given. I also changed the A321_perfs.txt, which had the Registration which LNM used, but i doesn't change in LNM. Also X-Plane has, if i open the ATC Window, the right Reg. So i guess X-Plane is using the perfs.txt

1 hour ago, flieger28 said:

LNM uses always a wrong registration.

No problems here.🤷‍♂️
LNM uses whatever the aircraft developer placed in the .acf file or what is given through X-Plane datarefs. Reg is often not given and the same for different liveries.
You can fix this yourself (from https://www.littlenavmap.org/manuals/littlenavmap/release/2.8/en/AIRCRAFTPERFEDIT.html#x-plane 😞

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X-Plane

Its value can be read with X-Plane Plane Maker program, opening the related aircraft file .acf, then main menu -> Standard -> Author, field ICAO code for ATC. It is stored as e.g. P acf/_ICAO BE58 in the .acf file.

A321_perfs.txt ? This is not an X-Plane file. Neither it is LNM related.

Alex