Flight from Vienna to Berlin, about two years ago: No passport controls at all. Flight from Berlin to Vienna, a few days later: same. Flight from Vienna to London last year: Brief glance at the passport. Flight from London to Montreal: No controls in London, heavy controls in Montreal. Flight from Montreal to London: Heavy controls in Montreal, no controls in London. Flight from London to Vienna: No controls, just a brief glance at the passport in Vienna.
Flight from Vienna to London, about a week ago: Three passport controls, the last one at the gate right before boarding. Why? – Schengen, the steward answered. Flight from London to Vienna: A brief glance at the passport at the gate before boarding. A brief glance at the passport in Vienna. Warsaw in three weeks should be fun.