Victor, CO2 is self reinforcing and the changes we have wrought in the environment don't stop just because we took a few months off poisoning the liveable biosphere.
Carbon locked up in permafrost continues to emit as the Arctic melts. Methane in the atmosphere continues to break down into CO2 and a lot of human methane emissions come from animal farming which has not stopped at all.
Air travel is a small proportion of human CO2 emissions and shutting down the planes doesn't affect. More than 8% of emissions for this measure. It has more impact than ground emissions but doesn't change the figures much.
Then there is the summer/winter balance, el nino/la nina which all impact the figures
We haven't had a really large volcanic eruption since Mt Pinatubo in the 90's which caused 2 years of lower figures.
If we look at it that way, our background emissions from power stations, trucks, shipping, gas CH at home, farming and land change, etc, is driving AGW on its own. Cars, factories, planes.. They are just the icing on the cake for AGW.
We.will.see.the.impact of Covid around Dec. It won't be much but it will be visible.
The NOOA CO2 stats are
here.
Enjoy.