The P-52 Merlin is a snub fighter that fits into the hangar of the RSIConstellation. It can be deployed during combat.
"Originally designed to pair with the RSI Constellation, the P-52 Merlin is now available to all pilots! A dedicated parasite fighter, the Merlin is designed to be transported from place to place aboard a larger ship. Boasting a centerline Gatling cannon and a Lightning Power engine, the Merlin is a fast, maneuverable ship that packs a surprising punch! Ideal for racing, local reconnaissance and fast combat." - Store page
The P-52 Merlin has a luxury counterpart, the P-72 Archimedes, that comes with the Constellation Phoenix, luxury touring variant of the Constellation. It is faster & intended more for racing.