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Be attacked. >> even where i am in the east, it doesnt feel like its brace fog an imminent attack. clearly the u.s. is warning that if american citizens want to leave, better now than later. if there were to be some sort of invasion, even a massive cyberattack, it could knock off-line commercial travel, divert aircraft. we all saw in afghanistan, how difficult it is to evacuate citizens once airports are compromised, once there arent flights, once theres a combat situation. i think one of the re...

>> reporter: with carriers only able to operate 10,000 flights out of a normal 28,000 on friday and fewer on saturday, passengers are stuck all over the world. >> i was coming from italy. i had to fly back on friday. you see i am here. i got to take the eurostar, but now i am driving to paris. in paris, no train to italy. everything is booked for two days. >> we should come back tomorrow, but there arent flights and trains, so i think we will wait here until monday to see if the situation change...