Thai AirAsia (FD, Bangkok Don Mueang) plans to raise up to THB1.5 billion baht (USD46 million) through the issuance of high-risk, secured, callable debentures. The three-year unsubordinated instruments carry an annual coupon of 5.4%. The airline will offer up to 1.5 million units, each with a par value of THB1,000 (USD30). Subscriptions from institutional and high-net-worth investors will run from April 7 to 9, ahead of the April 10 public issue date. Thailand's Securities and Exchange Commission approved the prospectus on April 2.