Free is the fare , which is the airlines revenue. Taxes are for the airport authorities and the respective governments of the origin and destination.

Baggage 20kg is correct too- economy class free baggage allowance is 20 hg globally. whatver extra you see at times are special offers in the market as part of fighting the competition.

Mind you - You may not get confirmation on all flights as you wish too, the booking class for redemption tickets may not be open for sale on all flights. :)

Not all those free n cheap are good :)
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- Listen to Many...Speak to a Few -