This article examines the legal conflict between consumer protection law and aviation law in resolving consumer disputes within the air transportation sector, particularly regarding airline liability for passengers’ lost belongings during international flights. This study aims to analyze the legal position of airline liability toward passengers, examine the ratio decidendi of Supreme Court Decision Number 649 K/Pdt.Sus-BPSK/2016, and formulate a harmonization model between consumer protection law and aviation law in resolving air transportation disputes. This research uses normative legal research methods with statutory, conceptual, and case approaches. Legal materials consist of primary, secondary, and tertiary legal sources analyzed qualitatively through legal interpretation and systematic legal analysis. The study finds that the lack of integration between consumer protection law and aviation regulations has created legal uncertainty and inconsistent interpretation in consumer dispute settlement. The Supreme Court positioned aviation law as lex specialis that limits the application of general consumer protection principles. This research proposes a harmonization model through sector-based consumer protection and reconstruction of BPSK authority in aviation consumer dispute resolution.
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