Do you mean the 757 Base Pack or the 767 Base Pack?

Anyway. To fix it i the 767, change atc_airline= to atc_airline=Speed Bird. Like this:

[fltsim.5]
title=CS 767-300 Captain Paint5
sim=B767-300RR
model=rr5
panel=
sound=RR
texture=british
kb_checklists=
kb_reference=
atc_id=N764A
atc_airline=Speed Bird
atc_flight_number=
ui_manufacturer="Boeing"
ui_type="767-300 RR"
ui_variation="British Airways"
ui_typerole="Commercial Airliner"
ui_createdby="Captain Sim"
description="767-300 Base Pack v1.5\n(c) 2011 Captain Sim www.captainsim.com"
ui_wglts=1

Mark