Possible Clues:

• Some transports in the Arctic tundra
• Aircraft that can land on snow
• Vehicles in cold conditions avoid roads
• They may ascend in the cold intention to enter heavens
• Aircraft miss parts of the runway
• GP gets senior citizen on to American programme
• Overlook tracks made by these vehicles?
• Vehicles don't observe proper discipline on motorway?
• Fliers in snowy areas seen in spring over country roads