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Priceline.com , the first American company to sell airline tickets directly over the Internet , surpassed the combined market capitalization of the three largest US airlines ( United , American and Delta ) after only two years of operations .
 Priceline.com, first, American, three, US, United, American, Delta, two years
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 Priceline.com, first, American, three, US, United, American, Delta, two years