Some people (I'm sorry I forgot exactly who) were having trouble with the airline refusing to disclose the tax calculation on their ticket for change purposes

The newest version of the MyFlights app and the MyFlights website will now display the raw fare/tax/fee calculation if the booking was created on Amadeus (so that's BA/CX/JJ/IB/QF/AY/RJ/LA... but not AA/JL).

www.myflightsapp.com (thanks to schofs for creating this tool)