In phantom traveller, Sam and Dean face a demon that is possessing various people related to a plane crash. The exorcism they perform is very much non-standard, in that it merely releases the demon from its vessel. As well as this, they use the Latin word christos to detect demons, which is never used again.

My question is, are these events particular to this episode or are they canon?

How can the event of Phantom Traveller be explained in relation to other episodes?