Neither of the above, but I can see why you're both thinking along those lines. First clue - it's role could be described as similar to the descendants of W4050.
OK, it's single-engined, 'western', a bit bigger than a bread box, comes, originally, from a long lineage, but hasmaybe jumped ahead of its time since then.
Not a U2. It featured in a well-known photograph, possibly 'faked', showing a suggestive formation flying past an historic building .....
And another, bigger clue - its undercarriage features five wheels .......
Clues are becoming harder, without giving away the answer, but, this is a single-seat aircraft, although two-seat trainers of earlier versions have existed.