John Rowley/iStock/Thinkstock(NEW YORK) — U.S. airlines are keeping a close eye on the Zika virus, with some offering waivers for cancellations or ticket changes for customers traveling to affected areas. One major Latin American airline and one U.S. cruise line are also offering waivers.

Until recently, the virus has been reported in Africa, South Asia and Polynesia, but now it’s also being found in the Americas.

An alert by the Pan American Health Organization was prompted last May after an outbreak of the disease in Brazil. The U.S. Centers for Disease Control and Prevention have issued a travel alert for 24 countries and territories where the virus transmission is ongoing.

United Airlines tells ABC News it is offering customers traveling to the affected regions a full refund or opportunity to rebook to a later date.

With a doctor’s note, American Airlines, LAN Airlines and TAM Airlines will allow a pregnant passenger to re-book without fees or request a full refund, according to the airline.

Southwest Airlines said it will continue to follow the established CDC guidelines, and as always, customers can change their travel itineraries without a change fee.

It is not just airlines offering a helping hand to passengers. At least one American cruise line is helping passengers reschedule too.

Carnival and its sister companies will let pregnant women and their spouses either switch to a route that doesn’t include a CDC alerted area, or hold a credit and re-book for a later date. They’re requesting a passenger wishing to take advantage of this new policy to give them some kind of verification of pregnancy, like a doctor’s note.

Delta Air Lines told ABC News it is monitoring the situation and coordinating with in-house medical professionals, the CDC and World Health Organization.

Copyright © 2016, ABC Radio. All rights reserved.

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iStock/Thinkstock(NEW YORK) — Some experts call it “hitting the wall,” others call it “the bonk”: Either way, it’s the all-around unpleasant situation when an athlete’s body shuts down even if they are in the middle of a race or competition.

ABC News’ own Dan Childs will show this week exactly what happens to the body when you hit the wall.

Childs, the managing editor of the ABC News Medical Unit, will run until he is crashes in an effort to show how lactic acid, carbohydrates and fat all interact to contribute to “bonking.”

Harold Pino, senior exercise physiologist at NYU Langone Medical Center’s Sports Performance Center, said that “hitting the wall” is generally thought to be the point when the body runs out of easy carbohydrates to process and will simply stop functioning properly.

This doesn’t mean your heart will give out but that you’ll feel extreme fatigue, disorientation and weakness.

“It’s when your body runs out of sugars to use as energy,” Pino told ABC News. “It’s a feeling of severe weakness and severe fatigue.”

In marathons, as people burn through hundreds to thousands of calories, their body can suddenly stop working even at the end of the race, Pino said.

“You see it at the finish line when a lot of the runners are looking at you and are really not there,” Pino explained.

Technically, it’s severely low blood sugar — hypoglycemia — that results in hitting the wall, Pino said.

“It’s like when your car runs out of fuel,” Pino told ABC News. “We can store so much carbs, and once you tap out on those carbs, you’re done.”

Hitting the wall usually happens shortly after a person reaches their “crossover point,” which is when the body switches from using carbohydrates for energy to using fat stores, Pino said. Once those carbohydrate stores are used up, an athlete can hit the wall in the span of just a few minutes, depending on how hard they are working.

It may seem impossible that marathon runners — or especially ultra-marathoners — can finish their races without hitting these walls. However these runners keep going at lower intensities, meaning they can go for miles and miles without bonking. If you work out at a maximum intensity level, you’ll crash much faster.

Elite athletes are more efficient at burning fat and therefore are able to push the “crossover point” further into their exercise so they can exercise more without risking extreme fatigue, Pino noted.

Amateur athletes or runners hoping to use this to eat a giant meal or stock up on snacks before a run should be warned that this really only applies after at least an hour of working out. People training more than an hour should consider having a snack to ward off the bonk, Pino said.

An athlete can also hit the wall when they build up too much lactic acid in their muscles. The acid builds up naturally in the body, but during intense exercise, the body produces higher levels than it can process. This causes the familiar burning sensation in muscles during a workout.

This kind of “bonk” is a little different than the one caused by the “crossover point.” This kind of hitting the wall fatigues the muscles so that the acid can be processed by the body. Dan Childs will push through the lactic acid buildup to hit the carb-depletion wall.

And it might not be pretty.

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Many men marched in women's red high-heel shoes, while others wore fancy flip-flops on Saturday during the sixth annual “Walk a Mile in Her Shoes” event at Findlay's Riverside Park. These newly-pedicured feet belong to two radio personalities, “The Big Kahuna” of 106.3 The Fox, left, and “Big Dave” Crosser of WKXA. Hundreds of men, women and boys walked a mile Saturday to increase awareness of domestic violence and sexual assault, and to raise funds for Open Arms Domestic Violence and Rape Crisis Services. (Photo by Nick Moore)

Many men marched in women’s red high-heel shoes, while others wore fancy flip-flops on Saturday during the sixth annual “Walk a Mile in Her Shoes” event at Findlay’s Riverside Park. These newly-pedicured feet belong to two radio personalities, “The Big Kahuna” of 106.3 The Fox, left, and “Big Dave” Crosser of WKXA. Hundreds of men, women and boys walked a mile Saturday to increase awareness of domestic violence and sexual assault, and to raise funds for Open Arms Domestic Violence and Rape Crisis Services. (Photo by Nick Moore)

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Participants in Findlay's Walk MS event stroll south along North Main Street on Saturday, in the annual fundraiser to benefit the Ohio Buckeye chapter of the National Multiple Sclerosis Society. The walk started and ended at the University of Findlay's Koehler Center. Participants had a choice of a one-mile “Fox Trot,” a three-mile “Golden Loop” or a five-mile “House Tour.” (Photo by Nick Moore)

Participants in Findlay’s Walk MS event stroll south along North Main Street on Saturday, in the annual fundraiser to benefit the Ohio Buckeye chapter of the National Multiple Sclerosis Society. The walk started and ended at the University of Findlay’s Koehler Center. Participants had a choice of a one-mile “Fox Trot,” a three-mile “Golden Loop” or a five-mile “House Tour.” (Photo by Nick Moore)

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