I will resolve this once we understand more about the causes of each incident. Different possibilities:

• Unrelated phenomena. Resolves NO

• Slightly related. For instance, lack of email access caused a miscommunication that played a role in cascading failures, but was not the main cause of the ground stop. Resolves NO.

• Significantly related. For instance, Microsoft server failures played a major role in whatever is behind the FAA ground stop. Resolves YES.

• Shared root cause. For instance, a coordinated cyberattack. Resolves YES.

These criteria are subjective and may allow for weird edge cases. Sorry.