<Table> <Tr> <Th> Code </Th> <Th> Standard position in fare basis code </Th> <Th> Meaning </Th> </Tr> <Tr> <Td> </Td> <Td> Second letter </Td> <Td> This often indicated that the fare was an "Excursion Fare". These fares typically had a minimum and maximum stay requirement to encourage use by the holiday market and not business travellers . </Td> </Tr> <Tr> <Td> Numerals </Td> <Td> Latter parts of the fare basis </Td> <Td> Numerals often indicate the maximum stay the fare rules will allow at a destination . Thus a YE45 is an economy excursion fare with a maximum stay of 45 days . Similar patterns could be YE3M indicating a 3 - month maximum . </Td> </Tr> <Tr> <Td> H or L </Td> <Td> Other than first letter </Td> <Td> High or low season </Td> </Tr> <Tr> <Td> W or X </Td> <Td> Other than as the first letter </Td> <Td> These two letters are commonly used in airfares to state if a fare is valid on a weekday (X) or restricted to weekends (W). The specific days of a weekend may vary, and can include Friday travel . </Td> </Tr> <Tr> <Td> OW </Td> <Td> On higher level fares, normally follows the initial booking code . </Td> <Td> One - way fare only </Td> </Tr> <Tr> <Td> RT </Td> <Td> On higher level fares, normally follows the initial booking code . </Td> <Td> Return fare </Td> </Tr> <Tr> <Td> Two - letter country codes </Td> <Td> Usually at the end of the code, except if followed by "CH" or "IN" </Td> <Td> Fare bases often end with two - letter country codes . This will be the case when an airline has an international fare in both directions . For example, a fare from Great Britain to Australia may be YE3MGB, and YE3MAU from Australia to Great Britain . This allows the fare to have similar rules, but may have some variations in change fees or to comply with local trade restrictions . </Td> </Tr> <Tr> <Td> CH </Td> <Td> Last two characters </Td> <Td> Child fare (typically up to 11 years old, but 15 in some cases) </Td> </Tr> <Tr> <Td> IN </Td> <Td> Last two characters </Td> <Td> Infant fare (typically up to 2 years old, but 3 years in some cases) </Td> </Tr> </Table> <Tr> <Th> Code </Th> <Th> Standard position in fare basis code </Th> <Th> Meaning </Th> </Tr> <Tr> <Td> </Td> <Td> Second letter </Td> <Td> This often indicated that the fare was an "Excursion Fare". These fares typically had a minimum and maximum stay requirement to encourage use by the holiday market and not business travellers . </Td> </Tr> <Tr> <Td> Numerals </Td> <Td> Latter parts of the fare basis </Td> <Td> Numerals often indicate the maximum stay the fare rules will allow at a destination . Thus a YE45 is an economy excursion fare with a maximum stay of 45 days . Similar patterns could be YE3M indicating a 3 - month maximum . </Td> </Tr>

What is the meaning of rbd in airline