19. Piper L-4 Grasshopper
> Average cost per plane: $2,537
> Total built during WWII: 5,611 — #16 most out of 52 planes
> Type: Communication
> Manufacturer: Piper Aircraft Corporation
> Crew: 1
18. Stinson L-5 Sentinel
> Average cost per plane: $9,090
> Total built during WWII: 3,590 — #19 most out of 52 planes
> Type: Communication
> Manufacturer: Stinson
> Crew: 2
17. T-6 Texan
> Average cost per plane: $25,839
> Total built during WWII: 15,094 — #3 most out of 52 planes
> Type: Trainer
> Manufacturer: North American Aviation
> Crew: 2

Source: Hulton Archive / Archive Photos via Getty Images
16. North American P-51 Mustang
> Average cost per plane: $52,541
> Total built during WWII: 14,501 — #4 most out of 52 planes
> Type: Fighter
> Manufacturer: North American Aviation
> Crew: 1

Source: Fox Photos / Hulton Archive via Getty Images
15. Curtiss P-40 Warhawk
> Average cost per plane: $54,472
> Total built during WWII: 13,738 — #5 most out of 52 planes
> Type: Fighter
> Manufacturer: Curtiss-Wright Corporation
> Crew: 1
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