US lawFederal (United States)RegulationsTitle 47 CFR — TelecommunicationChapter IPart 87Subpart O87.41947 C.F.R. § 87.419Supplemental eligibility.Last amended: 2016Year: 2026Length: 18 wordsOfficial source Cite as 47 C.F.R. § 87.419 (2026)Only one control tower or RCO will be licensed at an airport. [64 FR 27476, May 20, 1999]Previous47 C.F.R. § 87.417Next47 C.F.R. § 87.421