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https://i-invdn-com.akamaized.net/news/LYNXNPEC0D0AP_M.jpgAirlines can lose their slots at congested airports if they do not use them at least 80% of the time. The FAA said it would extend the waivers at New York’s John F. Kennedy and LaGuardia airports and Ronald Reagan Washington National Airport that were set to expire in October.