This is proving to be a challenging task. Many are doing this, and there are several data sources. We use ch-Aviation, and this is what we see as of April 5. This is an update to our tracking of this issue.
ch Aviation AirInsight
We are uncertain about accuracy because we think there could be/should be 150 more AOG. AvWeek has 670 as of April 1st, compared to our 536 AOG.
Co-Founder AirInsight. My previous life includes stints at Shell South Africa, CIC Research, and PA Consulting. Got bitten by the aviation bug and ended up an Avgeek. Then the data bug got me, making me a curious Avgeek seeking data-driven logic. Also, I appreciate conversations with smart people from whom I learn so much. Summary: I am very fortunate to work with and converse with great people.