51818
Among some of these holding companies and parent companies which are relatively well known , are the UAL Corporation , along with the AMR Corporation , among a long list of airline holding companies sometime recognized worldwide .
 UAL Corporation, AMR Corporation
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 UAL Corporation, AMR Corporation