It seems that there has been so much spam/fishing/bad emails from AOL to Google Mail that Google automatically puts all aol emails into the Google Spam folder. So, AOL people: your email is not being seen by Google people unless they specifically "filter" messages to allow AOL email in their Inbox.
For Google Mail people. Look in you spam folder. You will have to be proactive and set up a filter for every aol person with whom you correspond. Details on setting up filters can be found at https://support.google.com/mail/answer/6579?hl=en. Paste this in your address bar.
Also for Google Mail people: If you know about filters, you might be tempted to just put aol.com as the filter criterion; then route the messages to your Inbox. The risk in doing that is Google is putting aol into the spam folder for a reason: AOL seems to have been infiltrated and there are too many phishing attacks originating from that domain.
