I fly at least once a year, and as you might expect, I use airplanes to do it. Most of the time, I bring samples, but I've had no problems putting fragrance bottles in carry-ons. As long as your bottles are 3.4 oz/100 ml or less and can all fit unboxed in a one-quart Ziploc bag, you'll be fine.
When I bought my Straight to Heaven near LA, I separated the 1.7 oz bottle from the keepsake box and placed the bottle in the Ziploc bag and the keepsake box in another compartment of my carryon. The TSA screeners at John Wayne Airport (I avoid LAX like the plague) didn't pull me over before my flight to Minneapolis (I didn't need another security screening there to get back to Fort Wayne). Likewise, when I bought my PdN New York in Paris, the security screeners at both Paris-Charles de Gaulle 2A and Chicago-O'Hare Terminal 3 had to do tests on the soaps that I brought home from Paris (likely because of their density like most French soaps), but didn't touch the 1 oz New York. (O'Hare is a pain for international flights because you have to change terminals and recheck your bags once clearing customs, then get rescreened at your domestic terminal.)
And if you check a bag, you can put in up to 70 ounces of alcohol-based products such as fragrances, along with aerosols. Keep in mind that this is a combined limit for both alcohol-based products and aerosols, so buy a smaller can of sunscreen or hair spray if you have to.
Hope this helps.
That's what I worry about; I also had a 100ml tube of toothpaste taken once at JFK. The guy was nice about it, but there's no arguing. I wouldn't bring any full bottle of perfume in my carry on.
Stick with the ziplock rule or take your chances. As much as I enjoy my bottles I'd rather not risk loss due to breakage, leakage, or TSA confiscation.
Personally decanting is the way to go. Accessories for Fragrances is a great source for decant atomizers and Sally always throws in a handful of freebies.