Abstract: An air-to-air coupling 13 (e.g. for receiving a probe in probe-and-drogue refuelling) comprises retaining members 19, 27 for interacting with a further member (e.g. a refuelling probe) to hold the further member in place. An active drive system 39, 21 may drive the holding members and may thereby also actively drive the further member into place. Alternatively the active drive 39, 21 may drive another member such as a locking member 31 to hold the retaining members 19, 27 in position once the further member is in place. The active drive releases the retaining members 19, 27 or moves them out of position to allow the further member to be removed. This allows the further member to be inserted and removed with a lower force than is used to hold it in place. The coupling may also be used for in-air recovery of an unmanned aircraft.