Pilots seeing UFOs (or something) all over the skies

From Google UFO feed:

http://time.com/5220209/pilots-ufo-arizona-plane/

Are pilots seeing a resurgence of an unknown aerial phenomenon, or something more substantial?

These pilots can't be having a concurrent dissonant hallucination, or can they? It seems unlikely.

But what have they seen? A light above their airplanes, moving in an opposite direction.

The sightings don't have the patina of solidity that older sightings had -- Chiles/Whitted or Nash/Fortenberry.

But they have invigorated (resuscitated) the UFO topic, for now.

RR