Developers are marking the start of construction on a $29 million air cargo center at McCarran International Airport.

A spokesman for Las Vegas-based Marnell Properties says a Monday ceremony will mark groundbreaking for the nearly 201,000-square-foot air freight logistics center on about 19 acres at the airport's new Terminal 3.

The Marnell Air Cargo Center is designed to host freight and mail-sorting operations for companies including FedEx Corp., Southwest Airlines, Worldwide Flight Services, Allegiant Air and UPS.

R&O Construction is the general contractor. Work is expected to take about a year.