<Tr> <Td> Grumman XF5F Skyrocket </Td> <Td> 1940 </Td> <Td> United States </Td> <Td> </Td> </Tr> <Tr> <Td> Grumman XP - 50 </Td> <Td> 1941 </Td> <Td> United States </Td> <Td> </Td> </Tr> <Tr> <Td> Hawker Hotspur </Td> <Td> 1938 </Td> <Td> United Kingdom </Td> <Td> </Td> </Tr> <Tr> <Td> Hughes D - 2 </Td> <Td> 1943 </Td> <Td> United States </Td> <Td> </Td> </Tr>

How many types of planes were there in ww2