There were some important regulatory developments too that had taken place prior to IndiGo-commenced operations. In 2004, the government announced a policy called 5/20 Rule,78 which stipulated that private airlines had to complete a minimum of five years of flying and had to have a fleet size of at least 20 aircrafts to be eligible to get permission for international operations. In spirit, the 5/20 Rule was somewhat similar to Japan’s 45/47 Rule in the 1970s and 1980s whereby the government had reserved certain domestic and international routes for its national carrier. Similarly, the 5/20
  
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