American airlift line
Based on Los Angeles and New York, it radiates across the United States, with an overall aging of 10-12 days
Canadian air line
Based on Vancouver and Toronto, the radiation is fully increased, and the overall aging is 10-12 days
British air line
Based on London and Manchester, it radiates all over the UK for 10-12 days.
European air transport line
Based on Paris and Berlin, it radiates all over Europe, with an overall aging of 10-12 days
