A glitch was discovered in 1.75.0.124 (Jan 2018) where Churchills can fly. It disappeared in 1.75.0.154.
Apparently modern tank engineering didn't stop M1 Abrams from getting wrecked by a Strumpanzer II.
The number of players who get kills through ramming is ridiculous enough that there are achievements for killing enemy vehicles through ramming. Now comes in both aviation and maritime flavors, as a recently-added Steam achievement commemorates players who destroy 10 enemy ships by ramming them.
. It disappeared in 1.75.0.154.