Raza Perez, Director of Pricing and Revenue Management at Vueling.com has kindly offered up to 15 round-trip tickets on their route network to students attending the conference.  The tickets are free but you have to pay Fees+Taxes. The process is (i) register as a student by March 30 (ii) send me an e-mail that I will forward to Raza. If the tickets are oversubscribed, priority order is (i) those giving a talk (ii) first-come-first-serve. By the way, something you will understand fully: Tickets are subject to availability.