We are sorry that you were affected by seat changes on your Swiss flight. Regrettably, your flight was affected by an equipment change. Even though aircraft equipment changes are a rare occurrence, I have forwarded your email to our network planning department for their information and internal analysis. Swiss endeavours to honour all advanced seat reservations and requests. However, Swiss reserves the right to change seat assignments if deemed necessary for operational, security or safety reasons. While, as a rule, we make every effort to fulfil the wishes of our customers when allocating seats, it is not always possible to guarantee any particular seat. In this case, we have refunded your reservations and enclosed a Swiss travel voucher towards a future flight. Please accept our apologies.