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As countries around the world grapple with the rapid spread of the Omicron variant of COVID-19, the US Department of State is urging American travelers to prepare for any potential disruptions to their foreign trips by having "contingency plans" in place.

"US citizens who choose to travel internationally should be aware that they may face unexpected challenges related to COVID-19 as they attempt to return to the United States or attempt to travel from one overseas location to another," warned in its latest advisory. "US citizens who do choose to travel internationally should make contingency plans, as they may have to remain in a foreign country longer than originally planned, which will be at their own expense," it added.

The Department is also recommending travelers take out international travel insurance with coverage for COVID-related trip cancellation and medical benefits.

Why do Americans need a contingency plan for international travel?

The request comes as airline carriers cancel thousands of flights due to Omicron-driven staff shortages and winter storms. Around 1,328 flights into and out of the US were cancelled and more than 1,694 flights were delayed by Tuesday afternoon, according to aviation data tracker —adding to what has been a disruptive winter holiday travel period. According to FlightAware, the airline industry has cancelled more than 18,500 flights from Christmas Eve through Monday.

Read more: Flight cancellations and delays continue - what you should know

Challenges aren't limited to flights. US travelers also face additional restrictions when traveling internationally due to enhanced border measures in several countries. On Sunday, the French government announced that American travelers who have not received the full recommended dose of vaccinations would be required to . In recent weeks, Italy also tightened entry rules for unvaccinated passengers and Thailand extended its quarantine rules for Americans, regardless of vaccination status. Meanwhile, the Netherlands is still in lockdown and Morocco's borders are closed.

As restrictions are frequently changing worldwide, passengers are asked to regularly check the latest guidelines in the destination they are visiting to avoid last-minute issues.

Read more: Traveling to the US? Here’s how to meet the new one-day testing rule

As the demand for testing increases with the spread of Omicron, which presents another potential problem for overseas trips. Under the current rules from the Centers for Disease Control and Prevention (CDC), all international arrivals are required to present a negative COVID-19 result from a test taken prior to boarding their flight. Now due to diminishing supplies, it's recommended that travelers book their COVID-19 tests for the return trip home sooner rather than later to avoid additional disruptions because without proof of a negative result, travelers could be refused boarding.

"US citizens planning to travel overseas or currently overseas and planning to return to the United States should also contact their airline for specific information about testing requirements for travelers," the State Department said. "Airlines may adopt and modify their own specific policies to implement the CDC's testing rule."

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