North America Luxury Travel Market Size, Share, Competitive Landscape and Trend Analysis Report, by Types of Tour (Customized and private vacations, Adventure and safari, Cruise/ship expedition, Small group journey, Celebration and special events, Culinary travel and shopping), by Age Group (Millennial, Generation X, Baby Boomer, Silver hair), by Types of Traveler (Absolute luxury, Aspiring Luxury, Accessible Luxury): Opportunity Analysis and Industry Forecast, 2021-2031