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It had originally been developed as an airliner , the A. 204 , but when Aero could not find buyers for the design , it was militarised and successfully marketed to the Czechoslovak Air Force .
 A. 204, Aero, Czechoslovak Air Force
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:
 A. 204, Aero, Czechoslovak Air Force