13092
Instead , a menu of options may be considered , including installing infrared ( IR ) countermeasures on aircraft ; modifying flight operations and air traffic control procedures ; improving airport and regional security ; and strengthening missile non - proliferation efforts .
 airport, aircraft, missile
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 airport, aircraft, missile