If you want to get some nice vapor from an aircraft, start with a good, humid day. The hours after a storm are perfect since there is plenty of moisture in the air and the ground is wet meaning it will keep feeding the moisture for a while. Now you just need a big jet to climb out at high power settings. Enter an ANA 777-300ER stage left.
The engines were filling with inlet vapor as the beast hauled itself into the sky and the tip vortices were also doing their bit to pull the water from the air. The fact is was late afternoon so the sun was in a good position too meant that the combination was pretty ideal. We got a few like this for a while but eventually the humidity levels dropped and things returned to normal. Still, it was good for a while and there were other benefits to come.