The advances in battery life, flight control software and carbon fibre technology over recent years have made the use of small unmanned aerial vehicles (UAVs) as an airborne calibration platform for astronomical facilities a possibility. This is especially attractive for arrays of telescopes spread over a large area such as the Cherenkov Telescope Array (CTA). It is envisaged that the CTA will use UAVs to perform a range of calibration routines, with the primary routines being the cross-calibration of different telescope types, as well as monitoring of the multi-wavelength performance of CTA’s telescopes.