Two possible reasons for photo of Don Jr and Mueller in the same place at the same time:

1) White hat meeting between the two

2) Fake news - photo shopped.

Any others?

So, how does a reporter get to the gate to get this picture? Was the reporter a ticket holder as well?

Lot of weird coincidences here.

https://www.msn.com/en-us/news/politics/robert-mueller-and-donald-trump-jr-spotted-at-same-airport-gate/ar-BBL9jfp?ocid=spartanntp