Those staffing cuts mean customs and immigration checkpoints at some airports have been understaffed, leading to two- to three-hour waits recently.
If the line is long, some airports have other checkpoints that may be faster, even after a walk to get there.
Flights from Coventry were transferred to other airports and some from Cardiff have been cancelled, while some BA flights from Scottish airports have also been scrapped.
Some of the airports have been privatised in a bid to beat the clock.
Marchi said some of those airports have indicated that they would have to shut down operations for the first few hours of the new year to allow enough time to conduct the tests.
The main airports are open, but some airlines have cancelled flights following days of heavy snowfall.
They also suffer from being so ubiquitous at big airports: Regional airlines have some of the worst on-time and baggage-handling records among airlines and highest rates of canceled flights.
Some airlines have bunched up schedules at big airports to increase connecting opportunities, adding to congestion at peak hours.
Infrastructure such as ports, roads, and airports is poor, and attempts to bring in the private sector to modernize some of it, such as with airports, have not been entirely successful.
Some have taken to consulting on art for airports and hotels, offering website-design advice to their peers, and talking about developing apps to sell to visitors in vast numbers, of course.
Since the summer, masked health officials have screened the country's airports, hauling some 800 feverish-looking visitors off to quarantine on arrival.
The Channel Islands have experienced some of their worst conditions in decades, with airports still closed following heavy snow.
"There have been intelligence inputs about some terrorist activity, and therefore security has been tightened (at airports), " civil aviation spokesperson Moushmi Chakraborty told CNN.
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