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earlier this week , bad weather added to a labor dispute between delta airlines and its pilots caused scores of cancellations and hundreds of delays .
 delta airlines, its, its pilots
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
Answer:
 delta airlines, its, its pilots