Border control on intra-Schengen (ATH-TXL) flight?
I flew ATH-TXL today. Yesterday, I'd received an email from A3 about the temporary reinstatement of border controls on flights from Greece to Germany, but I couldn't find any information about it online including on the list of temporary Schengen opt-outs the EU has online. Lo and behold, there was indeed passport control upon arrival in TXL. Does anyone know why/since when this has been taking place?