The reality is that the British Prime Minister is in a very strong position and the EU knows that. The PM has the backing of the British electorate who voted to leave the EU then voted for a Parliament dominated by MP's whose constituents voted to leave. The PM clearly has control of the House of Commons which has voted through the EU withdrawal Bill.
Airbus needs its supply chain to work the day after we leave the EU. Responsibility for that lies with the EU. They have consistently been obstructive toward Britain but if they continue to do so they will damage Airbus Industry not just in Britain but in France, Germany and Spain. I doubt that the electorates of these countries will thank them for that. and I dare say the unions will be unimpressed.
It's not Britain that Airbus need to put pressure on it is the EU.