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With e tickets they often want your passport just to check the reference number on the ticket. Thai on the other hand willl want to see your credit card (as I found out having left it in Phuket for safe keeping!) If in doubt carry your passport- you'll need it any way when cashing travellers cheques. Again from personal experience a photocopy will not work at the bank. The rest of the time a photocopy tucked in your wallet provides instant id if required , thereby keeping your pport safe whilst on the pop.