VietJet Aviation Joint Stock Co., the Vietnam carrier known for its bikini-clad flight attendants, expects profit to surge 30 percent this year on rising passengers as it prepares for its Ho Chi Minh City Stock Exchange listing debut in February. A total of 23 overseas investors bought 66.5 million shares — equivalent to about 14 percent of VietJet — during a pre-listing stake sale last month, billionaire founder Nguyen Thi Phuong Thao said.