It depends on what "white" birds you're talking about......

Vision Airlines parked their three ex-UA 767-200s there when they lost the CIA contract out of IAD. Maybe that is what you're talking about?

However, ABX has been doing something out of SDF the last week (still trying to find out who the flying is for). The flights are:

ABX2618 SDF-MHR-HNL
ABX9770 HNL-SDF

I assume they are using N315AA for the flights since that is one of the only -200 ETOPS birds at ABX and it is all white with very little ABX stickers on the tail and fuselage.

Could be either one I guess.