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What exchange rate does El Al use when converting final payment amount to shekels?
In older days the merchants and their merchant banks[or service providers] would take funds in their currency. Say in this case USD. When the charge hits the issuer bank, the merchant and merchant bank gets there USD and were happy. The user would get charged in local currency Shekel in this case. The rate applied by his bank [and card provider, Visa/Master also take a cut] is the standard shelf rate to individuals.   When business growing and banking becoming more sophisticated, lots of Merchant Banks and Merchants have created a new business, if you offer Shekel to all users then you have lots of Shekel that you can convert into USD. So in this model, the Merchant makes some more profit from Fx spread, the Merchant Bank makes good money in Fx. Your Bank [and card network] loose out. You stand to gain because you potentially get a better rate. All this theory is good. But the rates are moving and its quite difficult to find out if the rates offered directly by EI AI would be better than those offered by your bank. I have no experience in this example, but I have tried this with large shops, buy 2 items one charge in GBP and other in local currency around 2-3 times spread over a year. The difference in rate was close to identical, at times better or worse in range of .02%