I think some people overstate the importance or relevance of BA's share in Flybe.
I could not agree more. Remember, BA have no representation on the Flybe board and have publicly stated that they had written down the value of their stake and would offload this if possible in the past.
I accept that you can never say never about the potential for a commercial deal, but I would put money on the fact that BA have absolutely no influence on any of the decisions taken by Flybe.....they are a very minority shareholder whose stake was heavily diluted by the recent share offer to well below the 15% they had originally.