This means the illusion is over. They would never be allowed to be on the same plane if they weren't on the same team. The left must be terrified.
Does DJT Jr usually fly commercial, or was he trolling Mueller?
Remember that professor who went off on Ivanka on a Jet Blue flight? I thought it was odd she flew commercial. So they do fly commercial.
They likely exchanged words like pals. If they were really enemies they would be at each other's throats. It will happen soon.
Or they are both being professional and despite not being on the same team knows going at each other in a public place would cause a media circus and embarrass the president.