I asked about buying Air Mail stamps once, some time ago. The answer was, they weren't available any more, as the only difference between Air Mail and First Class was that Air Mail was loaded on the plane first.
Heh.. for domestic service, first class is a synonym for air mail. The latter term really only has special meaning when shipping to other countries, particularly across oceans.
The difference between surface mail and air mail can be rather significant in that context, both in time and in cost.
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