I am looking to book a one week vacation in Iran in May/June this year. Of all the tour packages I am considering, they all feature at least 1 domestic leg in Iran (including Tehran-Shiraz, Shiraz-Esfahan and Esfahan-Tehran - although some of the tour packages use the 'land option' for some of these legs instead). I know one of tour packages use IR but I haven't asked about the others. What is the level of safety standard and on time performance for Iranian airlines domestically? What type of equipments are used and is there anything special that need to be considered when flying domestically in Iran?