Here is one example of many:

Take the Six Flags White Water amusement park in Atlanta, which implemented a priority queue system in 2011.

Some guests simply queue up for their rides. Those who purchase green-and-gold wrist bands – fitted with radio frequency technology – are able to swim in the pool or eat snacks before being alerted to their turn.

Guests who pay an even higher fee – roughly double the price of admission – get the gold flash pass, cutting their waiting time in half.

The company says it has been a huge hit and is now installing the system in all of its American water parks.