In planning options -> preferences -> misc.-> fuel prices, I can't find where to set the currency. I'd like to see fuel prices in EUR, but somehow my flight costs show up in USD. Help please!

This depends on the region settings of your iPad/Android/PC. You didn't mention which device you were using, but it's definitely the region settings of the device itself which are presumably currently set to US.

Thanks Tim. All my devices were bought in Europe. On my Windows 7 PC, cost is shown in US Dollars. The same flight synced to my iPad 2 shows the same cost amount but without any currency indication. How how and where, if at all, can I set currency = EUR?

Thanks Tim. The iPAD is not an issue because the currency is not specified, only the value which is the same as the value of the Sky Demon Plan (on PC). Now indeed by changing settings in the control panel --> region and language from "U.S. English" to "Ireland English" (by chance an English-speaking country that uses the Euro!), the cost now appears in Euro. However I suggest that Sky Demon address this in a future release because these are settings that should in all logic be selectable within the application, just as feet, metres, gallons or litres, and not somewhere deep down in Windows. Not all currencies of course, but at least USD, EUR, GBP and a couple of others. My particular problem is momentarily solved, but I don't know what impact this setting change will have if any on other applications. Thanks anyway.

It's simple a currency symbol issue, nothing else. No currency conversions are done by SkyDemon. We just take the actual value, which could be 1.56 for example, and hand it over to the operating system for display in local currency.