# C4S - C4-C6 Set of 3
With the arrival of nighttime airmail service in 1923, the U.S. was divided into three zones: New York to Chicago, Chicago to Cheyenne, Wyoming and Cheyenne to San Francisco, with a different rate paid for each zone crossed. Previously, mail was flown during daylight and transferred to trains at night.
| # C4S - C4-C6 Set of 3 | ||
|---|---|---|
| mint $299.00 | Add to Wish List C4SM | |
| used $90.00 | Add to Wish List C4SU |
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