My main concern about leaving is the impact on the economy. Companies like Nissan and Honda set up factories in the UK because cars made outside the EU were likely to be hit with import duties (currently 10% on cars made in the USA). By making them within the EU they avoided that problem. Now 75% of the cars made in the UK are exported across the channel. If we leave the EU where will they build the next generation of Electric or autonomous cars? Pretty sure it won't be in the UK but in Spain, France or Germany. Last year we exported 1,227,881 cars. That represents a huge amount of money and jobs.
Oh and the state of the UK economy certainly affects aviation.