BRIEF-Vietjet signs firm order to buy 100 new Boeing 737 Max planes worth $12.7 bln

Safran SA: * VIETJET SIGNS FIRM ORDER TO BUY 100 NEW BOEING 737 MAX PLANES WORTH $12.7 BILLION AT LIST PRICE - VIETJET

* THE DEAL WAS WITNESSED BY U.S. PRESIDENT DONALD TRUMP AND VIETNAMESE PRESIDENT NGUYEN PHU TRONG * VIETJET FINALISES A $5.3 BILLION AGREEMENT FOR LONG-TERM LEAP-1B ENGINE SUPPORT WITH GENERAL ELECTRIC- VIETJET (Reporting by Khanh Vu)