<Li> Phoenix Sky Harbor International Airport (1983 - 2005) </Li> <Tr> <Th> Secondary hubs </Th> <Td> <Ul> <Li> Port Columbus International Airport (1993 - 2003) </Li> </Ul> </Td> </Tr> <Ul> <Li> Port Columbus International Airport (1993 - 2003) </Li> </Ul> <Li> Port Columbus International Airport (1993 - 2003) </Li>

What does the rating for the america west airlines bond mean