There was one B-52 that was painted white. They used it for special test work and out at Edwards AFB they needed to reduce the heat load.
And interestingly enough, for many years the VC-137's used for Air Force 1 were maintained in the same configuration as Pam Am airplanes, since Pan Am spare parts were available quickly all over the world.
Pan Am ran the Eastern Test Range from Cape Canaveral for many years.