Tampubolon, Yanti Mahdalena, and You She Melly Anne Dharasta. 2024. “The Influence of Implementation of Transformational and Democratic Leadership Styles On Job Loyalty of Employees at Airport Operation & Service Pt Angkasa Pura Aviasi Kualanamu International Airport Deli Serdang”. Langit Biru: Jurnal Ilmiah Aviasi 17 (01). indonesia, 11-22. https://doi.org/10.54147/langitbiru.v17i01.973.