Sorry to be the bearer of bad news, but thats not available. The ancestor of your kit once came with those decals, but they'd be ancient if you found a set.
Constellations come in two basic flavors as models- the L-749 which has a shorter fuselage, and the L-1049 Super which is most identifiable by its longer nose, fuselage and tip tanks, primarily. I've bought Air France, Pan Am, TWA and BOAC decals for the 749s, but there aren't too many choices for the 1049, because thats the only 1/72 kit and they're in and out of production. Either choice you have is pretty cool though, because those are new schemes for models.
Here's a good site for airline things:
http://www.airline-hobby.com/shop/index.cfm?action=DisplayMain
Bill