I think I'm correct in saying that a substantial amount of that 1 Billion cash is actually passenger ticket money that has been paid in advance. Once BA's reserves fall below a certain value, the travel agencies/credit card companies stop forwarding us the cash until the passenger has flown ( just in case BA go bust in the mean time). This is at about the same time that the oil companies start asking for cash up front rather than payment a month in arrears (in case BA go bust again).
Obviously BA want to keep the precise amount at which our creditors lose confidence in us very close to its chest, but it doesn't take a rocket scientist (or a BASSA rep) to realise it could be around December time at our present cash flows.
One only has to take a look at BA's monthly fuel bill to see that if we have to pay for fuel up front, we are finished as a business.
My guess is we are paying at least 100 million a month for fuel. 6 months of that reduces our 1.4 billion "cash" to 800 million and takes us to December. Then BA's losses really kick in for the winter.
All this is obvious stuff. Hopefully, the rocket scientist BASSA reps have drawn up a new business plan for BA as well as a new industrial agreement and we will all be able to go back to how things were.