From their website:
"AZAL's new "1+1" campaign - buy one air ticket, get the second for free""March 11 2016, Baku - Azerbaijan Airlines (AZAL) announced the launch of a new campaign due to Novruz holiday. During the national spring holiday Novruz, anyone can buy two air tickets of the economy or business class for the price of one.
The campaign applies to round-trip tickets from Baku/ to Baku in the following directions: London, Paris, Berlin,
Tel Aviv, Beijing and New York. The cost for the second air ticket will not be charged, except for administrative fees.
Sales period within the campaign: March 18 - 27 2016
Flights period: April 1 - May 31 2016 Air tickets purchased within the campaign should be of the same flight and class. According to the terms of the campaign, air tickets can only be exchanged together.
Tickets can be booked on the website of the company
www.azal.az and purchased at AZAL sales offices."