If you wish to propose to your girlfriend on a Himalayan peak, a new organization called Private Luxury Group (www.private-luxury-group.com) will have you both airlifted, along with a 10-carat diamond, to the spot. Similarly, should you desire a last-minute escape to a private villa in Provence, with a limited-edition Rolls-Royce for transport, this also can be arranged. Private Luxury Group, which promises to provide one-stop shopping for any luxury travel itinerary from start to finish, is the brainchild of the private air charter company Air Royale International. Each provider in the group’s consortium must meet requirements that include a minimum of $10 million in annual transactions and U.S. incorporation for at least two years. . . .