While hanging out at Rainbow Canyon awaiting the next jet, someone was flying high above. They were pulling a contrail at their altitude so you had a really good idea of their flightpath. They were flying regular extended orbits above us. The racetracks they left in the sky made it all pretty simple. A look at an ADS-B tracker told me that this wasn’t a tanker waiting for trade. It was NASA’s DC-8. This is a rare beast indeed and, while still a long way off, I was glad to get a shot of some sort of it.