Heathrow Connect was an open-access operator connecting London Paddington and Heathrow Airport. Unlike Heathrow Express, the service called at all intermediate stations. Services were operated jointly by Heathrow Express and Great Western Railway. In May 2018, the services were merged with TfL Rail in preparation for the launch of the Elizabeth Line in 2019.
| Current airports|
| Current franchises|
Chiltern | East Anglia (Stansted Express) | East Midlands | Essex Thameside | Greater Western | InterCity East Coast | InterCity West Coast | Merseyrail | New Cross Country | Northern | ScotRail | South Eastern | South Western (Island Line) | Thameslink, Southern and Great Northern (Gatwick Express) | TransPennine | Wales and Borders | West Midlands
Defunct British Rail sectors