Two people have been killed and another seriously injured after an explosion at a Delta Air Lines maintenance depot at Atlanta's airport in Georgia.An aircraft tyre reportedly exploded, according to a union representative who spoke to Sky News' US partner, NBC News. Several fire and police units responded to a hangar at Hartsfield-Jackson Atlanta International Airport, Georgia shortly after 5am (10am UK time).The airline said it is conducting an investigation and working with local authorities."The Delta fa ...