Palm Beach International Airport was renamed President Donald J. Trump International Airport on July 9 after a state law took effect and the Federal Aviation Administration authorized the change.
The Federal Aviation Administration said the airport's three-letter code would be updated from PBI to DJT.
Workers installed new highway signs outside the airport ahead of the change.
Travelers expressed mixed reactions to the renaming; one passenger said the president should be honored while others said they preferred the airport's previous name.
Protesters outside the airport echoed mounting demands for an independent inquiry into the shooting of Lorenzo Salgado Araujo, 52, a Mexican national.
DTTM Operations, the private company that manages Trump's intellectual property, filed three trademark applications in February for "DJT," "President Donald J. Trump International Airport" and "Donald J. Trump International Airport," and all three are listed as pending.
The Palm Beach County board of commissioners voted 4-3 in early May to approve a 35-page licensing agreement that permits the county to use the Trump name and explicitly prohibits Trump from receiving royalties, fees, or revenue from purchases of airport merchandise at the airport.
"Most of the time, these things are meant to be an honorary renaming and in this case, obviously, there's a private entity owned by Trump's family whose trademarks are now licensed to a publicly-owned airport," said Josh Gerben, a D.C.-based trademark attorney, who warned the nonexclusive license could allow third-party deals outside the airport.
Airport officials said ownership and operations will not be affected, calling the move "a branding change only" and saying the transition "will occur in phases." Rebeca Krogman, a spokesperson for the airport, said it has "no current plans to sell branded merchandise" and is "unaware of any vendors currently selling airport-branded merchandise."
The renaming is the subject of two separate local lawsuits.
The Florida legislature passed the renaming legislation along party lines in February, and Gov. Ron DeSantis signed it into law in March.
More than 8 million passengers use the airport annually, and Eric Trump said the president's plane was the first to land at the newly renamed airport at 5:01 a.m. on July 9, writing on X, "As a son, and someone who flies out of this airport nearly every day, I will forever be proud to see the initials 'DJT' on my boarding pass."
The trademark applications list a wide array of goods and services that could bear the airport's name, including watches, jewelry, collectible coins, clothing, backpacks and suitcases, and services such as airport construction, aircraft fueling, baggage check-in, lounges, snack bars and baggage security screening.