Kim Day has resigned her position as executive director of Los Angeles city airports — including Los Angeles International Airport (LAX) — as of Friday, October 7th.

Insiders at the airport had speculated that Day would leave the position as soon as Los Angeles Mayor Antonio Villaraigosa and the new city Board of Airport Commissioners appointed by the mayor began revamping the controversial LAX master plan.

As executive director of Los Angeles World Airports (LAWA) — the agency that operates the city’s four airports — Day oversaw and managed LAX and city airports in Van Nuys, Ontario and Palmdale.

But Day was closely linked to the $11 billion LAX master plan, strongly supported by former mayor James Hahn and then-local Councilwoman Cindy Miscikowski.

Hahn was defeated for reelection as mayor and Miscikowski’s candidate, Flora Gil Krisiloff, lost the local 11th District City Council seat.

Villaraigosa then appointed anti-airport expansion civic leader Val Velasco to the airport commission, further signaling that Day’s days at the airport were probably numbered.

In her resignation letter, Day said she will return to her career as an architect. Day has more than 25 years of experience as an architect in all phases of design and implementation, including substantial work on aviation projects.

She began her professional career in 1977 with Daniel, Mann, Johnson and Mendenhall of Los Angeles and San Francisco.

She was appointed airport department executive director in November after serving as interim executive director starting in August 2003.

Day began her service with the airport department in 1999 as deputy executive director of project and facilities planning.

Janelle Erickson, spokeswoman for Villaraigosa, said the mayor accepted Day’s resignation and will move quickly to name an interim executive director.