Brightedge published a report on how AIOs have changed over the past 12 months. Summary in this blog and you can also download the full PDF report there.

Key findings:

• AIO presence went from about 30% to 48%
• AIOs are bigger now (average over 1200px tall)
• Not a ton of overlap between cited & ranked sources: just 17% of AIO cited sources are also in the organic top 10 on the same SERP - but it varies by industry

Takeaways:

• 52% of queries don't have an AIO, so organic rankings still matter
• When an AIO is present the first organic result is below the fold now
• You gotta consider your visibility in both AIO citations and organic results