A plan to expand and modernize Harry Reid International Airport — the seventh-busiest in North America — received an informal go-ahead from Clark County commissioners Tuesday.

The proposal, presented by County Department of Aviation officials, would increase the number of gates at the facility’s oldest terminal, improve passenger access at the 12-year-old Terminal 3, and add new parking areas and facilities for transportation services while upgrading multiple roads. Officials say it could alleviate delays in arrivals and departures.