Large capacity and range of non-stop flights.
In principle, achieved a higher reliability and safety than the planes and helicopters. (Even in major disasters airships showed high survival rate of people.)
The cheapness of transportation, especially the large and bulky cargo. Less than helicopters, fuel consumption and, consequently, lower cost of flight per passenger or per unit mass of the load.
Size of the interior can be very large.
Length of stay in the air can be measured in weeks.
Airships do not need a runway (but required mooring mast) - indeed, he may not land, but simply "hang" above the ground (which, incidentally, is only feasible in the absence of strong crosswinds).