In many cases, airlines won't have to drum up passenger demand because freight carriage on many routes will be enough to cover the cost of the flight - airline freight demand saw a slump in 2019 and the first two months of 2020, but since then it has seen a huge resurgence as demand has picked up.
Several airlinesSeveral airlines are converting passenger aircraftconverting passenger aircraft to temporary cargo aircraft (meaning they can carry cargo on the main deck as well as in the cargo hold), which shows just what the upsurge is.