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British Airways announced today Tuesday that all Concorde flights are to be grounded immediately following recommendations by the air navigation authorities .
 British Airways, the air navigation authorities, Concorde
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:
 British Airways, the air navigation authorities, Concorde