Don't bother writing another letter to them. If they didn't reply the first tiem then they have nothing for you. Think about how many letter airlines get per day, thousands. If they replyed and sent stuff to each person then it would cost them $$$$ each month for unessesery freebees. Sorry mate but don't bother writting to these major airlines as your most likely not get anything.
Dan Valentine - Bad Ass MOFO Photographer