Rudy,
ya does what ya gotsta do,,,,
that being said, I have done that for a color I wanted to use when I was building plastic models. Not sure how well it will translate for doing a whole airplane. I might suggest that you could spray it outside on a semi warm day, more important would be for it to be calm. If its say 55 degrees, just get the plane warm and the spray can warm, take them outside and spray a coat, bring them in and put the thing in the bathroom with the exhaust fan running for awhile till it gasses off. Just a thought
As for spraying it into a jar, I am not really confident that you could accomplish much that way. first issue would be the waste of spraying it into the jar, you will undoubtedly loose a great deal of paint backwashing out of the container, and in the process of doing it you will also loose some thinner which will be difficult to overcome because you dont know what kind of thinner to replace it with. Now understand I haven't tried this on the scale you are suggesting, I am just supposing sitting here thinking about it, It may in fact work fine. I cant say that its something I would want to try, I would rather monokote the thing entirely than try that FWIW.
but thats me, and I haven't any expertise in what you are thinking about,, cant say dont know,,,,,
Heck load the thing up and come on up, we can paint it in the shop for ya,,
oh well, maybe a touch far to drive huh,, well offer stands

This was in the instructions for the (dark arts) TF Sea Fury that I reviewed for RCM som time back.  The instructions were for Lustrecote - but should work for others???

Make a paper tube around 1/2" dia x 8" long.  Hold it close to the nozzle when you spray, then point the other end into a jar.  The tube catches the spray and directs & drips it into the jar.  (I like Will's suggestion to use wax paper with a hole in it over the top of the jar).  Even spraying this way the paint has a lot of aerosol left in it - you have to let it gas-off for a couple hours.

I only did it for a few drops of touch up (worked fine) but did not try to empty a complete can that way.

That's a really cool idea, Wayne - I'll give it a try someday!
Blessings,
Will

Wayne I have done that numerous times for a spray paint color I needed and could not get in a regular can of paint.  I learned that method of retreiving ether from starting fluid cans.  Still make sure you have the can pointed in the right direction when you punch the hole in it.  DOC Holliday

Hi Guys
 last year i actually did this because i couldn't find enough duck egg blue and light sae gray for my Cougar that i painted in royal navy colors.
i actually did the turn the can over and vent out the aerosol. then carefully punched a hole in the bottom and poured the paint into a jar.
it was way too thin too have brushed on but the cans were old and cept clogging so i thought it would work to spray it with a gun.
well it workes with some exceptions!
do not and I repeat DO NOT SHAKE THE JAR OF PAINT OR THE GUN FULL OF PAINT. even after severall days the paint still apparently has propellent
in it! the wall of my shop still has the nice coat of light sea gray on it . it actually blew the top off of the jar when i shook it to make sure it was mixed before pouring it into the gun.I lost most of the jar on the wall, the floor and oh yeah ME! luckilly i was far enough away from the model it was about the only thing that didn't get paint on it.
so yeah it works BUT i dont think you could brush it and i probable wont do it again unless i had to.
Dave jr.

Guys,

This has been used to get starter fluid from spray cans for making diesel fuel for some time. For paint you first shake the can to make sure it is mixed really good, next invert the can, let it settle for a minute or so then keeping the can inverted spray out the propellant. Put the can in the freezer for an hour, shake it good again then invert and spray off any remaining propellant, set the can upright. Now take a sharp center punch or ice pick and punch a hole along the top and slowly pull the punch out to releave any remaining pressure (make sure you have eye protection on just in case it spurts, not likely but why take the chance). Now you can use a can opener to open a large hole and pour out the paint into a jar, put a small amount of thinner back into the can and wash out any remaining pigment then thin as you need for spraying or brushing. Big advantage with doing this is to be able to add thinner and retarder if needed for better flowability and a smoother finish.

Best,      Dennis