This is coolbert:
Biplane? World War Two? Biplane?
"The Gloster Gladiator was already made obsolete by the time of its inception, yet the type soldiered on through 1944."
AND AS FLOWN BY THE RAF ACE OF ACES MARMADUKE PATTLE. [THIS MAKES THE COMBAT ACHIEVEMENTS OF PAT PATTLE EVEN MORE SIGNIFICANT?]
"The Fiat CR.42 was designed off the successes of the CR.32, with Italy still believing in the capabilities of biplane aircraft. [as compared to the single wing monoplane.]
ITALIAN COMBAT FIGHTER PILOTS FLYING THE CR.42 DURING THE BATTLE OF BRITAIN  WITH VERY POOR RESULTS.
See two Internet web site comparing the plus and minus of the biplane [two wings] as compared to the monoplane [one wing].
Here also an oddity and curiosity. The jet powered biplane.