How does vapors occur? It's a bit difficult, isn't it?
I don't understand it! For those who are not familiar with it, here is an explanation of how vapors are generated.
Also, please take a look at the seven vaper trails of seven different aircrafts that occurred on the same day.
The last Delta is Rainbow.
0:00 Japan Airlines Airbus A350-941
0:54 All Nippon Airways Boeing 787-9
1:07 All Nippon Airways Boeing 777-381ER Eevee Jet Livery
1:53 Air France Airbus A350-941
3:17 Lufthansa Boeing 747-830
4:04 United Airlines Boeing 777-222ER
4:43 Delta Air Lines Airbus A330-941