Go cards were replaced by Bee cards on 20 July 2020. The city's urban bus services are unique in New Zealand in that rides are offered free to tertiary students. The city's bus service primarily utilise diesel buses, with a battery-powered bus entering service in 2021. The city has 13 inter-connected bus routes serving the city's suburbs. 12 of these form loops, so one bus serves two routes in one trip. The bus line to Summerhill is a complete loop so does not do this. All lines connect to the Main Street terminal, which is adjacent to the city's central Square. Direct services to Massey University and IPU exist for students. Tertiary students are offered free bus rides. This is funded by parking fees at the universities. Bus services connect the city to several of the region's other towns, the Palmerston North airport, and Whanganui. These run less often than the urban services. Daily services run to the nearby towns of Linton, Ashhurst, Feilding (via Airport), Foxton, Levin and Marton. Inter-regional routes are operated by Intercity and Tranzit. Intercity's routes run south (to Wellington), north (towards Auckland, via Whanganui, Rotorua and Taupo, or Napier) and east (to Masterton) from the bus terminal in The Square, Palmerston North. Horizons is currently seeking public submissions on the future of the urban bus services. Two options are proposed: one will increase frequency during the peak-hours, while the other will see more bus stops being closer to more people. Air Palmerston North Airport is located in the suburb of Milson, approximately north of the central business district. It is a regional gateway to the central North Island region. The airport has regular services to domestic destinations including Auckland, Christchurch, Hamilton, Napier, Nelson and Wellington. Flights are currently served by Air New Zealand and Originair. For 12 years Freedom Air served Palmerston North from Brisbane, Sydney, Melbourne, The Gold Coast and Nadi with a Boeing 737-300 and an Airbus A320-200. But when Freedom Air closed for good in 2008, international services from Palmerston North ended for good as well. The airport is presently the operational base of the Massey University School of Aviation. The airport is also a freight hub for Parcelair. Rail Palmerston North is on the North Island Main Trunk Railway. There is only one passenger train run by KiwiRail: the weekday-only Capital Connection commuter train once a day to and from Wellington.