You can recommend students to BA till you're blue in the face, it doesn't mean they are going to take them. Most of this 'We've got links with BA' stuff is just marketing rubbish. The only real links between schools and airlines occur when there is a sponsorship agreement in place and that in itself is not an automatic endorsement of the quality of the school, more often than not it is chosen on the basis of price with the assumption that it will meet a basic standard of training or lose the contract.