Brexit would have major implications for disabled people who want to travel across Europe. An EU directive ensures that disabled travellers can get assistance boarding planes, going through airports and the transport of mobility aids.
In the wake of Brexit, there is no guarantee that these standing arrangements would continue. Furthermore, membership of the EU also ensures that UK blue badge holders can use their badges in the EU zone. Again in the wake of Brexit, there is no guarantee that this arrangement this would continue.
Now I think that is important to point out that running assistance initiatives in airports and other transport networks is very expensive. They are not the sort of thing that transport hubs take on lightly.
A few years ago, I was refused entry on to a bus from an airport in Turkey so I personally can see a situation where a lot of the rights that I take for granted are repealed in the wake of Brexit.