Originally Posted by
Kmxu
One consideration is the change of terminals, from A to C/D at IAD, and from A to C at EWR (could be B/C or A on return). It is better to post your proposed flights here so that the suggestions will be more helpful.
BUF-EWR is likely on UAX; all UAX departures are now out of Terminal C (I do not recall seeing anything other than mainline out of the new Terminal A). As such I would think transiting with a wheelchair will be easier in EWR because there will be no terminal change.
On the way back, I think it won’t be pleasant either way because you will have to re-clear security no matter what.