Chinese state-owned planemaker COMAC will conduct flying displays of its C919 and ARJ21 jets in five Southeast Asian countries, it said on Tuesday, as it looks to lay the groundwork for future international sales. Over the next two weeks, the C919 and ARJ21 jets will conduct showcase flights in Vietnam, Laos, Cambodia, Malaysia and Indonesia, the Shanghai-headquartered aircraft manufacturer said in a statement. It follows the arrival of the C919 passenger jet in Vietnam to participate in an air show there on Monday, after the Singapore Airshow concluded on Sunday.