Fast track
Fast track services are very common (virtually universal) on departures (security) but less common on arrivals. Most Far Eastern airports offer expedited immigration for premium class pax, for example. In the US, you can register for Global Entry, which ensures seamless entry through border control and customs.
The US also offers TSA pre-check, which speeds up departures security and ensures you don’t have to get out your liquids, take off your coat/shoes/belt etc. If only the UK authorities offered such a service to pre-screened travellers.