What you are already type rated on say A345 makes no difference if you join on the B744. Bond and Bank Guarantee applies. To avoid any confusion the Bank Guarantee forms part of the total Bond. This guarantee has either to be in cash when you arrive or as a Bank Guarantee by a branch in Singapore. The Bond is the Grand Total you are signed up to repaying SQ should you leave earlier than the 5 years of being on the line. It is Pro- Rata if you leave earlier. After 5 years on the line the Bank Guarantee is cancelled and you get your money back.