What are the Chicago aviation police?

Q: How many aviation officers are there?

A: About 300. Working at the city's two major airports, they are a mix of part- and full-time cops, and some work as police in other departments, said Adam Rosen, a spokesman for Service Employees International Union Local 73, which represents them. Full-timers earn between $50,000 and $88,000 a year and cost the city about $19 million a year.