Highwaymen who travel and raid their victims by air.
A group of flywaymen become enemies of the professors at Madame Geraldine's during Etiquette & Espionage. They are after a valuable crystalline valve prototype, and give the school an ultimatum to hand it over. This is complicated by the fact that Monique de Pelouse has stolen and hidden the valve, and refuses to give up its location to her teachers.
The flywaymen that Sophronia encounters during Waistcoats & Weaponry wear baggy britches tucked into tall boots, sashes around their waists, handkerchiefs tied around their heads, and cravats pinned with onion brooches.