Yeah they are based in Barcelona... But don't fly there and their main base is in Italy with another substantial base in Sicily and 2 large bases in France, also interesting is that they must operate sh*t loads of W patterns, hardly any of their destinations have only 1 flight, and a huge chunk of them have flights between non bases, examples of this are Touluse, Vigo, Asturias, Zaragoza, Brest, Caen, Lille and more...
See for yourself:
VOLOTEA - Destinations
In fact as I've been typing, does anyone know where aircraft are based? Some places seem to have too much of a comprehensive route offering to not have aircraft based, such as Palma, Naples, Bari, Olbia, Ajaccio...
This is an intriguing and fascinating little airline, I hope to see them as successful as the EU big 4. I'm impressed by their Greek island operations too.