It seems that flightaware is confusing flights filed to/from the IATA code YNJ (ICAO: ZYYJ, Yanji, China), which has regularly scheduled commercial flights, with the Langley Regional airport, (ICAO: CYNJ, IATA: none, Langley, BC, Canada).
Either that, or Air China has 737s taking off from a 2743-foot runway with enough fuel to fly across the pacific. I know that Chinese pilots are reported to do crazy things with their airplanes, but this seems a bit much.
However, there are some flights showing up into Langley that seem plausible, like a Cessna coming from Abbotsford.