Once the government outlawed the sale of turtles under 4 inches size, reptile-associated Salmonellosis decreased dramatically. Many animals must be quaranteed. I baby turtle would surely die during the quarantine. There are also restrictions on transporting animals on airplanes. Most airlines will allow small animals in suitable containers.
Travel is very stressful for baby turtles.
A baby turtle needs to travel in the passenger section of the plane. It won't be as small, though. If you know of people who breed turtles, you can still get a baby turtle for adoption. The best way to find such people is to check out a local turtle or reptile association and take it from there. Baby turtles are awfully cute and awfully wonderful pets, and it is a great feeling to look at your healthy, adult turtle and know you have raised it from a hatchling.