mrtango,
Do operators of the 757/767 (UPS/Delta/American/United/BA etc...) have GNSS equipment installed, or are these operators predominantly conducting primary navigation solely using DME/DME/IRU for the FMS?
Would be nice to know, appreciate any insight on this
The 757/767 airframe was certified circa 1980.
Circa early to mid 1990s Boeing undated production aircraft to a far more robust FMS, with GPS sensing. But, operators did not retrofit. The price would have been prohibitive.
So, most of the airlines operate 757/767 aircraft with both the original and the highly updated FMS suite, depending upon delivery date.