Chinese online travel platform Trip.com has turned heads by launching its most expensive offering to date: a space flight package costing at least 5.1 million yuan (US$759,900).The six-day trip includes several days of preflight training followed by a 90-minute suborbital flight operated by US-based provider Virgin Galactic, which takes off from Las Cruces, New Mexico.The first four days are devoted to preparation and training, with the air-launched space flight taking place on the fifth day,...