To enable the Beijing Subway to complete a successful transition to the new distance-based fare system, all entry gates will be locked, and ticket sales will be suspended, as of 21:00 on 27 December 2014. This will affect all lines except for the Airport Express.
Passengers already travelling on the trains at that time may continue until their exit station, although it might also be a good idea to leave at the next opportunity where there is a good onward connection via another means of transport.
Riders heading to the airport should either take taxis or ensure they travel from Dongzhimen or Sanyuanqiao stations. Make sure to use the dedicated Airport Express entrances. Travellers heading into Beijing from the airport should either take taxis or be familiar with connections by bus (or get a taxi) at Dongzhimen and Sanyuanqiao stations.
Finally, please be sure to touch in and out on both the Subway and Beijing Bus services as of 28 December 2014. The minimum fare will then be increased to RMB 3.— instead of RMB 2.—, putting it on par with fares paid in Shanghai.