Bryjak and Radner were on a return flight from Barcelona after performing in Wagner’s Siegfried at the Gran Teatre del Liceu. They had played the roles of Alberich and Erda in the opera.

They were also travelling with Radner’s husband and child, who also died in the crash.

Deutsche Oper Am Rhein, where Bryjak was a regular performer, posted a message of condolence to their Facebook page.

A bass-baritone, Bryjak (54) was originally from Kazakhstan, and had performed a large repertoire of operas with conductors such as Daniel Barenboim and Sir Simon Rattle.  Radner, 34, was an esteemed contralto and had performed across the world under the batons of Antonio Pappano, Christian Thielemann and more. She made her Met Opera debut in 2012 in Wagner’s Götterdämmerung.