Originally Posted by Nosmo King

As far as on-time performance, there is speculation that WDR problems were masked until fNW aircraft were mixed in with fDL because fNW the DOOR HAD TO BE CLOSED to generate an out time. Some people I have talked to think that some fDL were turning on the beacon early to generate the out times and thus creating a false dataset for d0 performance. I don't have any way of verifying that theory.