<Tr> <Td> Buffalo </Td> <Td> New York </Td> <Td> United States </Td> <Td> BUF </Td> <Td> KBUF </Td> <Td> Buffalo Niagara International Airport </Td> <Td> </Td> </Tr> <Tr> <Td> Calgary </Td> <Td> Alberta </Td> <Td> Canada </Td> <Td> YYC </Td> <Td> CYYC </Td> <Td> Calgary International Airport </Td> <Td> </Td> </Tr> <Tr> <Td> Cancún </Td> <Td>--</Td> <Td> Mexico </Td> <Td> CUN </Td> <Td> MMUN </Td> <Td> Cancún International Airport </Td> <Td> </Td> </Tr> <Tr> <Td> Cedar Rapids </Td> <Td> Iowa </Td> <Td> United States </Td> <Td> CID </Td> <Td> KCID </Td> <Td> The Eastern Iowa Airport </Td> <Td> </Td> </Tr>

Where does frontier airlines fly to and from