[FLYING -PLANE]

Mr CAN YOU HELP US AND MAKE US KNOW WHATS THE DEFFERENCE BETWEEN REVALIDATION AND DOCUMENT EXCHANGE ;WHEN WE MAKE DOC EXCHANGE JUST WHEN I WILL TAKE PENALITY OR IT HAVE OTHER
WHAT DOES IT MEAN REFUND AND ALL TYPE OF REFUDN WITH AMONT PENALETY WITH %PENALETY MANUEL REFUND AND TAX REFUND
I WOUD LIKE THAT MY FRIEND UNDERSTAND IATA AREA AND HOW WE CALCULATE PRICE OF TICKET THE MEANING OF CODE TAX YQ QX.....