Jan 10 Private Vietnamese airline VietJet expects net profit to climb 30 percent in 2017, after its bottomline almost doubled over the past 12 months, founder and CEO Nguyen Thi Phuong Thao said in an interview on Tuesday. Thao said the budget airline’s pre-tax profit rose 91.6 percent year-on-year in 2016 to 2.3 trillion dong .