The franchisor obtains additional business for its own flights. So, for example, Comair in South Africa trading as British Airways feeds traffic onto
BA's own
CPT- and
JNB-
LHR flights from other RSA domestic locations such as
DUR and
PLZ as well as from elsewhere in Southern Africa such as
HRE and
WDH. So today
BA parks its aircraft operating to the RSA all day at either
CPT or
JNB. Before Comair was appointed a franchisee
BA operated a probably uneconomic, add-on 744 flight between
JNB and
DUR . This may have been necessary to obtain contracts with both government and commercial organisations that would otherwise have been exclusive to
SA.
BA also take a small proportion of the Comair operating as
BA sales revenue. My (possibly faulty) recollection is that this may be 6 per cent of the total revenue.
The franchisee gets to present itself to potential and actual customers as if it were the franchisor, in this case British Airways. So Comair is a oneworld associate trading under the
BA brand. Indeed if you book a ticket on-line for a Comair operating as British Airways flight you will book it on the British Airways web site. So Comair does not need to maintain its own site.
This sort of relationhip and other factors such as its passengers using facilities like
BA's airport lounges as well as obtaining Avios
FF points help to explain the charge of what might be 6 per cent.