The Sindbad Registration form does not accept the @ sign (German Keyboard AltGr + q and English Keyboard Shift + 2) when trying to fill in the email address, therefore no registration possible.
http://sindbad.omanair.com/sindbad/join.jsp (Contact Details)
In the last 2 months have written several Emails to Oman Air Headquarters in Frankfurt including Director Nicky Samarasinghe and received apologies but no help. Judging by their activities so far, they don't seem to care about it.
Any idea which keyboard language/key combination would work to enter the @ sign?