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Lap child (infant) international ticket is usually 10% of a full-fare adult ticket for either economy, business or first class. It does not depend on actual fare paid by an accompanying adult. That's the reason you were asked to pay extra $$ to make up the difference between economy and business class infant tickets. That ticket agent (btw, was it an airline ticket agent or an independent travel agent?) who booked your tickets should've warned you about it. If that was indeed an airline employee, you could find out his/her name by asking customer service to locate it in your PNR.

[This message has been edited by Eugene (edited 01-01-2002).]