I think they're PPG codes.

or there's this, if you can decipher the information!:

PPG original formulation .

Formulation Report
Date:23 March 2011
FLI.1008M : PRIME : DURALIT 03 TC NOPB : FLI.1008M : 1989 : -Body : BIANCO : 1008M : Alitalia : AIR
Brand Reference: FLI.1008M
Finish Effect: Solid
Category: Good match


Main Layer:FLI.1008M
Price Code:
MSDS Number:MX07

Or there's this:
https://www.schemecolor.com/alitalia-logo-colors.php

Or this:

https://www.kustomservice.com/gb/146-stratos-colors