The airport was forced to shutter the concourse for the afternoon due to a shortage of Transportation Safety Administration officers, who have been working without pay for three weeks and are missing more shifts as the shutdown drags on.
The security checkpoints in terminal G will be closed after 1 p.m. on Saturday, Sunday and Monday, he said.
Frustration took shape during a demonstration Thursday where some TSA employees voiced their concerns by rallying outside the airport's busy domestic terminal.
"We do not expect any operational impact as we have arranged to fully utilize alternate gates for flights originally scheduled out of Terminal G", said Rachel Rivas, a United spokeswoman.
Miami International spokesman Greg Chin said the airport has had TSA workers call in sick at twice the usual rate, and TSA managers were unsure whether they would have enough staff to operate the airport's 11 checkpoints during normal operating hours.
"We felt we had to make a decision before the weekend", Mr Chin told the newspaper. "They're erring on the side of caution".
At Fort Lauderdale-Hollywood International Airport, a spokesman said TSA "call-outs" have been minimal and that they aren't planning to cutback on security checkpoints - yet.
TSA says the sickouts are not disrupting air travel. Workers at those shops are being relocated to work in other areas of the airport temporarily.
Passengers should wear easily removable shoes, follow the 3-1-1 rule for liquids or gels in their carry-on, and avoid accessories that resemble weapons.
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As such, all flights which would usually concourse G during this time will instead depart from concourses H and F.
In an attempt to ease financial woes for Transportation and Security Administration workers punching the clock without pay amid the government shutdown, the agency is offering employees one day's worth of pay and a $500 bonus.
Union officials said some TSA officers have already quit because of the shutdown and many are considering quitting.
TSA employee Jamie Keys is has been serving Atlanta travelers for 14 years, and even though he has been reporting to work as promised, he says he has nothing to show for it.
"No employee can be expected to work indefinitely without pay", Thompson said.
This staffing crisis is negatively affecting the National Airspace System, and the shutdown nearly certainly will make a bad situation worse.
As the partial government shutdown reached its third week, thousands of controllers are among the hundreds of thousands of furloughed workers nationwide.
More than 800 TSA employees at Logan Airport are preparing to go without pay until the government shutdown ends.