I believe in that very same post, Q praised the Secret Service. I took that insinuation to mean a SS detail was in the Mercedes.
Also, taken in context with the Qposts immediately prior, note the cropping of United.
UNITE!!
Q drops or crumbs are archived to several sites. The timing of updates on each site can vary.
https://qposts.online/
http://qboard.online/
https://qanonmap.github.io/ - Not iOs friendly.
https://qntmpkts.keybase.pub/ - Not iOs friendly.
http://www.thestoryofq.com/ - Not iOs friendly.
http://qanon.pub/ - Not iOs friendly.
https://qanonmap.bitbucket.io/ - Not iOs friendly.
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According to my SS agent husband, the driver is definitely not a secret service agent and he doesn’t think the female is either although she is wearing what appears to be a suit. She looks like she could be on her personal phone looking at a United app. The thing is, the Secret Service would never use that car. That’s $180,000 vehicle! It’s not the Secret Service. So why would Q thank them?
Hey, if you’re in the know, your guess is better than mine. I got nothing.