British Company Aeralis Developing A Modular Jet Trainer Supported By The Royal Air Force British Company Aeralis Developing A Modular Jet Trainer Supported By The Royal Air Force A rendering of the different configurations of the design being developed by Aeralis in flight over the White Cliffs of Dover. (Image: Aeralis) Aeralis project, supported through the Rapid Capabilities Office, revolves around a common fuselage with interchangeable engines and wings. The British company Aeralis has been awarded last month a three-year contract by the United Kingdom Ministry of Defence to continue the development of its modular jet trainer aircraft with the support of the Royal Air Force Rapid Capabilities Office (RCO). According to Tristan Crawford, Chief Executive Officer of Aeralis, this aircraft will be the first to be fully developed in the UK, without international partnerships, since the BAE Hawk in 1974.