Which retailer operates the most remote regular delivery service to an inhabited location, overcoming extreme geographic isolation?

Geographic barriers present unique challenges for retail logistics networks. Some retailers have gone to extraordinary lengths to serve remote communities, pushing the boundaries of supply chain management. This poll tests your knowledge about extreme retail logistics in challenging geographic locations. Can you identify which retail delivery operation holds the record for reaching the most remote inhabited location on Earth?

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Amazon, with its delivery service to Tristan da Cunha in the South Atlantic Ocean (1,500 miles from nearest continent)
Royal Mail, with its postal delivery to the Edinburgh of the Seven Seas settlement (accessible only by 6-day boat journey from South Africa)
Australia Post, with its service to research stations in Antarctica (requiring specialized ice-capable vehicles)
FedEx, with its delivery service to Ittoqqortoormiit in Greenland (accessible only 2 months per year due to sea ice)