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Although the AIDAluna is registered in Italy, AIDA is the premier cruise brand in Germany so not surprising that the majority of passengers are German. AIDA is part of the US Carnival Corporation, whose brands include Cunard and P&O (UK), AIDA (Germany), Costa (Italy), Carnival (US), Holland America (US), Princess (US), Windstar (US), and Seabourn (US). Of course, cruising attracts a very international clientele, but the majority of passengers will reflect the home country of each brand.