Swiss Airlines does not send ticket invoices. However, if you need one for your business or even as an individual, you can receive a new booking confirmation free of cost. The airline will send you this free of charge up until 100 days after the flight has been completed.  However, if you surpass this time, you need to pay 30.00CHF for each transaction. Also, note that you can even use the E-ticket confirmation for invoice purposes and the receipt may be internationally recognized. So, you can submit it for reimbursement from your office or for your employees with no VAT.