When flying the Longitude the other night I noticed that the contrails are black at night. Looked like engine trouble or something. Although it’s night condensation is condensation and the only time you get dark black smoke coming out the the engine is when there’s a problem with the engine both d…

Black Contrails at night

AngryBadgerZA September 19, 2021, 7:36pm 6

Does the wrapping happen because the inboard ones are being caught in the outboard engines wake?