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In the early 1980s I was installing some e-beam equipment at a Hewlett-Packard facility in Santa Clara CA. My contact pointed out a clsoed-off room and told me that they built the atomic clocks there. I was impressed, having built a electron microscope that was designated for NBS.
a couple of years later I got stranded at JFK by snow, ended up spending 2 nights and fell in to a conversation with a man who had a luggage cart with several pieces of rack-mounted equipment. He told me that he had just returned from Europe, farance, I believe, and the top unit was a "flying atomic clock" along with a power source. He said they travel the world with them to compare and coordinate the time standards of different countires, and that the flights changed the clock's time!
Q: Would the two flights in opposite directions cancel out each other?