{"id":"S99011773","label":"Free flight (Air traffic control)","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh99011773","normalized_label":"free flight (air traffic control)","broader":["http://id.loc.gov/authorities/subjects/sh85002704","http://id.loc.gov/authorities/subjects/sh85066764","http://id.loc.gov/authorities/subjects/sh85090433"],"aliases":[],"source_identifier":"http://id.loc.gov/authorities/subjects/sh99011773","provider":"lcsh","revision":"8bdb0155027602ba","taxonomy_revision":"f050b5d4780b1289","title":"Free flight (Air traffic control)","url":"/topics/S99011773","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"14451004761224643170","address_version":"morton4x16-v1","coordinates":[0,23,39730,62464],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}