I fly extensively with 2 chucks and a small black neoprene bag filled with liquids atty's and batteries.
You must place your chuck in the TSA bins, so they can see it. Most TSA ask what it is, and state they have never seen an ecig that big. Leave your batteries in the chuck so you can demo the unit to them.
On board it is a different story.
Get a window seat on the side that your shirt pocket is on. If you are looking towards the cockpit that is the left side.
"A" seats are window seats.
Turn the air on, so it is blowing around your face. Close the window shade, to ensure no daylight infiltrates.
Once seated, lean towards the window and turn your head sideways towards the window, and press the chuck button 3 seconds before you take a puff.
Take a deep puff, but release the button before the puff is finished so as to clear the atty from any potential vapor that may escape.
Hold the puff in your lungs, and release it slowly using tight lips. There should be no vapor.
Obviously night flights are perfect for stealth vaping, but make sure the passenger next to you does not have a night light on.
Always make sure you have a small rag or kleenex with you. The fact that you are taking longer deep puffs less often, may lead to a wet shirt pocket. Blow your atty out often and make sure you have spare batteries.
As the batteries drain, the chance of a leak and excess liquid build up, increases considerably.
Up till now i have never been caught stealth vaping on planes. I get a certain exitement when i stealth vape...sort of "the getting away with it" factor.
If you have a cup of hot cup of cofee on the plane also take advantage of that...take a drag...place your lips to the cofee cup and exhale...people will think the cofee is really hot and giving off vapor.
Other than that, avoid discussions on a plane. Some people like to go on and on narrating their life story to you, and then as if that was not enough they will find some other topic of discussion. It's difficult to turn to the window anad vape whislt they are talking to you.
Make sure the passageway is free and clear of hostesses...you don't want to be holding the vapor in, and the air hostess asks you "cream and sugar?" or do you want ice in your drink?.
It happened to me once and I just looked at her with a ......ed smile but did not answer.
If nothing else works, take frequent trips to the lavatory. Sit down and vape towards the floor.