Thanks for the answers. If I was allowed a 20 hour or so 'layover' or 'stopover' that would do the trick. What I would like to to simply is arrive on the return in Philadelphia -- say early afternoon. Then leave the airport and stay overnight at a hotel and take a morning flight the next day.
The flight sets I'd be looking for would be
Phoenix/Barcelona (via Philadelphia) (no stop over or layover)
Amsterdam/Phoenix (via Philadelphia) with a stop over as between the long flight and the serious backlog at the TSA 'recheck' line, in our 60's, I am just too old for that these days <smile>.