***Link*** :: [§ 91.135 Operations in Class A airspace.](https://www.ecfr.gov/current/title-14/section-91.135) ***Description*** :: `= this.link` ***Author*** :: [[FAA]] #### Key Quotes * must conduct that operation under instrument flight rules ([[IFR]]) * conducted only under an ATC clearance received prior to entering the airspace * equipped with a two-way radio... maintain two-way radio communications * [[Transponder]] / [[ADS-B]] #source #far