The Federal Aviation Administration (FAA) recognizes Trenton–Mercer Airport (TTN) as a commercial service airport. It was built in 2007, which is relatively new for an airport. Its runways are also in good condition. In general, newer airports and those with well-maintained runways are safer than older ones.
The nearest large city to TTN is Philadelphia, about 40 miles (64 kilometers) away. The drive from Philadelphia to TTN is about an hour in good traffic conditions. Mercer County, where TTN is located, has a population of just over 375,000 people. That's much smaller than Philadelphia's population of 1.5 million people.