A Malta Air Boeing 737-800 operating as Ryanair flight FR1879 experienced explosive decompression at FL150 when engine debris struck the fuselage, shattering a cabin window and partially ejecting a female passenger before fellow passengers restrained her. The crew declared a mayday emergency and executed an immediate return to Thessaloniki Macedonia International Airport, landing safely with no fatalities. This incident underscores critical vulnerabilities in cabin window integrity against uncontained engine debris, mirroring past fuselage tearing events like Aloha Airlines Flight 243 but distinct in involving window implosion and passenger ejection. Operators must now prioritize regulatory reviews of maintenance procedures and Boeing 737 window design to prevent similar catastrophic failures in the sector.