Craig--
The Spyderco model is the “Pride”, described as created for just such a situation as you mention. Here’s a link to its page on their site:
http://www.spyderco.com/dealer_product_i...C2NA5WN9EKT4CADBoker & Case both have Folding Hunter (larger 2-blade) & Sodbuster (small or large, single-blade) patterns.
Several companies also offer Copperhead & Trapper patterns . Both are mid-sized 2-blade designs. I’ve carried a “German Eye” brand stag Copperhead off & on for years, but finally gave it up because it didn’t lock open. It never caused any comments, whether used to clip an errant string in church, or to cut a steak in a restaurant. Blades are sub-3-inch length.
And then, there are the numerous "old-fashioned" slip joint patterns: Stockman, congress, sow-belly, etc.
You might look at the ubiquitous Opinel, too, though it has a ring lock. If that’s an acceptable alternative, Cold Steel’s “TwistMaster” is an updated, hell-for-strong version—though I think it’s been discontinued.
Consider, too, rather than trying to take it with you, purchase it locally. Presumably, if it's legal to sell, it's legal to posess. You'll have the additional benefit of a useful souvenir, as well.
If questioned, you're a knife collector, right? & just wanted that useful souvenir...
Good luck.
David