sentences:  At one time, the headquarters of national flag carrier Vietnam Airlines were located at Gia Lam Airport.On April 8, 2008, a Soviet-built Antonov An-26 turboprop aircraft on a training mission crashed into a field in Thanh Trì District, in the outskirts of Hanoi, killing five Vietnamese military pilots.The plane took off from Gia Lam Airport, and crashed on its way back.