RobK From United Kingdom, joined Sep 2004, 3970 posts, RR: 17
Reply 2, posted (3 years 1 month 1 week 11 hours ago) and read 2250 times:
Quoting rw774477 (Thread starter): is the same Boeing / Airbus flight number assigned to a specific aircraft while it is being tested etc or can it change from day to day
Generally it will stay the same throughout testing, but if there's a conflict with another aircraft one of them will use the l/n instead or occasionally the last 3 of the registration in the case of the Chinese.
The BOE flight number is the numerical part of the variable identifier (ZA236 for VT-ANH, for example, will be BOE236).
A recent example of a conflict would be WE201 (Emirates A6-EGW) and YP201 (Indian Navy P-8 IN321). The Emirates used the last 3 of its l/n (1034 - BOE034) on the days that the P-8 was also flying.