Originally Posted by
orbitmic
Could you tell us what you are trying to do? Interlining has multiple dimensions - ticketing, luggage, etc. BA interlines with the immense majority of legacy airlines luggage wise and probably nearly all of them ticketing wise, so in practice, you can get (very expensive) tickets combining end on end where no common fare exists. If you have such a multi-carrier tickets, your luggage can be through checked in the immense majority of cases.
Of course, as amply discussed elsewhere, if you are on separate tickets, BA's policy is no through checking, even where both itineraries are BA ticketed and operated.
It pertains to a single ticket on Virgin Atlantic ticket stock where one segment is operated by British Airways and the the second segment by Virgin Atlantic and the question pertains to through check in of luggage to the final destination which prompted the question of the whether BA interlines with Virgin