Ice Runway
The Annual Sea-Ice Runway (ICAO: NZIR) is a type of seasonal ice runway made on frozen McMurdo Sound for the U.S. Antarctic Program during the summer Antarctic field season in proximity to Hut Point Peninsula, which has McMurdo Station and Scott Base. The ice runway was used since the 1950s when the bases were established, but has fallen out favor in 2010s in favor of two runways on land, at Williams Field (NZWD) and the compacted snow runway at Phoenix Airfield (NZFX), which replaced Pegasus Field (NZPG) in 2017.