helicopter

The airport, which operates the single busiest runway in the U.S., was the site of a January midair collision between an American Airlines flight and an Army Black Hawk helicopter that killed 67 people.

Border Patrol agents made arrests in downtown Chicago on a recent weekend, and an overnight raid on a South Side apartment building last week used Black Hawk helicopters and netted 37 arrests.

Air-traffic control operations have faced heightened scrutiny following a deadly midair collision between an Army helicopter and a commercial jet in Washington, D.C., earlier this year.

The effort involved trap experts, dogs, trail cameras, setting and monitoring 100 traps, and helicopters to transport people and equipment.

Schwarzman, who usually arrives by helicopter, also bought the farm next door to host pheasant and partridge shoots.