Transportation[edit] U3, an underground rapid transit line in many major German/Austrian cities: U3 (Berlin U-Bahn) U3 (Frankfurt U-Bahn) U3 (Hamburg U-Bahn) U3 (Munich U-Bahn) U3 (Nuremberg U-Bahn) U3 (Stuttgart Stadtbahn) U3 (Vienna U-Bahn) Avies (IATA code: U3), an Estonian airline Cessna U-3, the military model of the Cessna 310 aircraft German submarine U-3, one of several German submarines B
![U3 - Wikipedia](https://cdn-ak-scissors.b.st-hatena.com/image/square/1a234aca98e729be6be6ab038a70b198bdf59287/height=288;version=1;width=512/https%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fen%2Fthumb%2Ff%2Ff3%2FU3logo.svg%2F160px-U3logo.svg.png)