Nobody tells the parents that their newborn baby is ugly, even if the baby
is ugly. It's called being polite.

If you are talking about ugly aircrafts, just remember that USA is using
a-10 one of the ugliest ones. F-15 is not ugly, its just old crap compared
to the new aircrafts such as f-22 or the Eurofighter. f-15 can only be
compared to su-27 and both are obsolete.