Ice is at a temperature of 0 ï°C; the surroundings are at about 20 ï°C. For ice to melt, it must gain energy from the surroundings. Energy can be transferred (move) from the surroundings to the ice by conduction through the metal or plastic. Metal is a better conductor than plastic, so energy is transferred more quickly through the metal.
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(Not all partner airlines advertise itineraries on Delta.com; to book award flights on those airlines, you will need to call SkyMiles customer service at 800-323-2323.) The number of miles needed depends on the airline, the route and the availability.