The $5m a day figure Beagle and you mention Blackcap was the average over level 4 and level 3. The figure will be no where near that now we are in level 1 without social distancing on flights.
Yes some passengers will use credits but there will also be some "catch-up" bookings taking place that will rebuild cash levels to some extent. The cash burn will still be down but the curve will look like a U or a backwards J at least.