California has played a central role in NASA's push to test its X-59 jet and usher in an era of commercial supersonic air travel. Here's what to know.

NASA's Quesst mission looks to develop a supersonic aircraft that could one day transform commercial air travel in the United States.

Ultra-wealthy buyers looking for a private jet have a huge range of options to choose from. At one end of the market, the smallest private jets hold only a handful of passengers. Meanwhile, at the ...

The X-59 is designed to travel faster than the speed of sound without creating a loud sonic boom. The ultimate goal is to prove that quiet supersonic flight is a viable option for commercial airlines.