Protip: you can come in to Brussels through Amsterdam. Passport control line in AMS is negligible (at least at 5AM, though I'm sure it's not  too bad at other times either), and it's only a 2h train ride straight from the AMS airport to Brussels.

I’m confused is there a passport control for those flying from within EU?

chain rewards the curious | initial contributor at @interface | /interface /wijuwiju /walkthewalk | online at app.interface.social/wijuwiju.eth

No. Flying within the Schengen area is check free