Some additional comments on wheelchairs:

There may be a difference on treatment for manual versus electric models. BA always ask re dimensions and weight and, understandably, are very particular about asking if the wheelchair has batteries. I don’t have experience of electric wheelchairs, so can’t advise.

Going slightly off topic you need to be careful about the tagging of wheelchairs as luggage. There does not appear to be a seamless process for handling this, especially if the trip involves different airlines. On a recent trip MAD>LHR on IB and then LHR>ABZ with BA, at check-in with IB they didn’t put a luggage tag on the wheelchair. I specifically asked for one, but at the gate the IB agent took it off saying “if there is a tag on it, it will not be delivered to the door.” (BA have always put a tag on the chair.) At LHR the chair was there at the bridge when we arrived, and then we dropped it off again at the bridge for the LHR>ABZ sector. On arrival in ABZ, lo and behold BA had put a luggage tag on the wheelchair at the bridge in LHR.

As I understand it (at least for BA): No tag, no go on plane, so beware. I would imagine the same applies to pushchairs.