<Tr> <Td> MAINE </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> Bangor </Td> <Td> BGR </Td> <Td> BGR </Td> <Td> KBGR </Td> <Td> Bangor International Airport </Td> <Td> P-N </Td> <Td> 265,245 </Td> </Tr> <Tr> <Td> Portland </Td> <Td> PWM </Td> <Td> PWM </Td> <Td> KPWM </Td> <Td> Portland International Jetport </Td> <Td> P-S </Td> <Td> 837,335 </Td> </Tr> <Tr> <Td> Presque Isle </Td> <Td> PQI </Td> <Td> PQI </Td> <Td> KPQI </Td> <Td> Northern Maine Regional Airport at Presque Isle </Td> <Td> P-N </Td> <Td> 11,488 </Td> </Tr>

How many major airports are there in the united states