The Jade Whisperer is the personal airplane of Guildmistress Dasha Eltsina. Though the plane is listed in public registries as a common Hoover Heavy Industries CR-4P, the large personal fortune that Eltsina commands makes this unlikely to be the reality of the situation. The most common theory is that the identity of the plane, like everything about the Guildmistress, is shrouded in a veil of secrecy. It is likely a smaller model such as a Havoc or Ingersoll, so as to be compatible with the landing deck on the Jade Fan, but any more specific information is currently unavailable. 
One less popular rumor is that Eltsina flies one of the planes known as Phantom Junkers, but this has never been more than conjecture.