<Tr> <Td> United States (Texas) </Td> <Td> Houston </Td> <Td> William P. Hobby Airport </Td> <Td> </Td> <Td> 1971 </Td> <Td> Present </Td> <Td> </Td> </Tr> <Tr> <Td> United States (Texas) </Td> <Td> Houston </Td> <Td> George Bush Intercontinental Airport </Td> <Td>--</Td> <Td> 1971, 1980 </Td> <Td> 1972, 2005 </Td> <Td> </Td> </Tr> <Tr> <Td> United States (Texas) </Td> <Td> Lubbock </Td> <Td> Lubbock Preston Smith International Airport </Td> <Td> 6 </Td> <Td> 1977 </Td> <Td> Present </Td> <Td> </Td> </Tr> <Tr> <Td> United States (Texas) </Td> <Td> Midland / Odessa </Td> <Td> Midland International Airport </Td> <Td> 7 </Td> <Td> 1977 </Td> <Td> Present </Td> <Td> </Td> </Tr>

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