I believe Graeme is correct, there is an exemption from the fasting requirements for Muslims who are travelling. However, I have worked in Muslim countries as an aircraft pilot, and rarely saw people taking advantage of this exemption when travelling on my aircraft. I think the exemption is more interpreted that if you have to make a long voyage by foot during Ramadan, you can take in what you need to sustain yourself during your walking.
As for non-Muslims, we are not obliged to fast, and I have never ever seen or heard of any Muslim asking or expecting a non-Muslim to fast. But, common courtesy dictates that non-Muslims should do their best to avoid eating, drinking and smoking in front of those who are fasting.
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