Boeing 737-322. 25 years old, MSN 24667
Had previously been flying for American, ATA, Lithuanian and FlyLAL:
SCAT Airlines LY-FLB (Boeing 737 - MSN 24667) (Ex ES-LBA LY-AQU N392UA ) | Airfleets aviation
According to
AvHerald, an oxygen bottle exploded. How exactly that would cause a fire is not clear.