Profit and loss is quite simply an accounting thing
It is the lack of cash that can kill an airline but if it is never likely to make a profit then the investors stop putting in more cash. 70% of all the money silverjet ever had will have been given by investors and not earned by carrying people. If people keep giving the airline £22m for new shares every 6-9 months than the airline can keep going for ever. The supply of mugs who would in invest in a airline at this time is limited. They may find that they would have done better burning £11m and putting the other £11m in a proper bank