With COVID-19 grounding mostinternational flights, the list is surely short, especially if restricted to long-haul flights. While https://www.flightradar24.com/blog/charting-the-decline-in-air-traffic-caused-by-covid-19/, the site doesn't seem to have details of the sort I'd like. OpenFlights seems to be even less useful for this purpose.
If I want a list of city pairs for the US, https://thepointsguy.com/news/april-long-haul-routes-american-delta-hawaiian-united-airlines/ largely suffices for April, though I'd have to search those city pairs to get details.
I am especially interested in a list for each day, or at least each week.