On certain routes we only carry passengers one way at the moment while waiting for things to open up. A skeleton network is being maintained by a lot of airlines, with government subsidies and cargo revenue paying the bills. A complete lockdown is unlikely to happen as we have the mechanisms for dealing with a pandemic already in place but heavy restrictions could be imposed again if the numbers start to surge.
I don't intend to travel until normality has been with us for a few months, scrambling to get home early to beat quarantine as happened to tourists visiting SA recently doesn't appeal.