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However , these techniques by themselves cannot completely mitigate the risk of domestic attacks and would not protect U . S . airliners flying to and from foreign airports .
 domestic, U . S, foreign airports, U . S . airliners flying to and from foreign airports
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 domestic, U . S, foreign airports, U . S . airliners flying to and from foreign airports