Qatar Airways and Etihad Airways have both plans to increase the capacity from Doha, respectively Abu Dhabi to Tehran.
Qatar Airways has proposed an all-A330 service to Tehran as of 6 March 2016 on all of the 18 weekly rotations. This route is today mostly operated by A320, and sometimes A330/B777.
Etihad Airways is increasing its flights to the Iranian capital from 7 to 10 weekly, starting 5 February 2016, and later on to two daily on 1 March 2016. All flights are scheduled to be operated by A320.