There are two types of bank transfer options:
Real time payments – real time & online banking  - payment is taken immediately. Ticket are issued automatically and e-mailed to you as soon as payment has been successful.
Non-real time payments – offline bank transfers - these payment options will be made available depending on the country of departure and departure date. As these payments cannot be confirmed real-time, Emirates has to wait for the payment to come in to the specific bank account. As soon as the payment is reported as successful, the ticket will be issued. Read about offline bank transfer payment here(opens in the same window).