On 28th April 2013, Swiss Avro 146-RJ100 "Jumbolino", HB-IYT, landed at Airport Bern-Belp in Switzerland. This charter flight WK 2281 from Barcelona to Bern-Belp was operated by Swiss European Air Lines on behalf of Edelweiss Air. The BAe 146/Avro RJ is powered by four Lycoming LF507 turbofan engines which have a low level of operational noise. And that is the reason why this regional jet aircraft is also called Whisperjet.