Note: Actual performed piece was Symphony No. 4 in E minor by Brahms.
[Note added about an hour after this entry was first published. I am doing this inside UA89 EWR-PEK. The wifi access I purchased does not allow me to watch youtube videos. However, the Wikipedia entry for Brahms 4 does contain soundtracks to the music. Guess what, the piece played was Brahms No. 4 after all. The movements are: Allegro no troppo, Andante moderato, Allegro giocoso, Allegro energico e passionato. Should have trusted my first instincts.]