UPDATE 4-BA hints worst over for business travel, shares up

* H1 pretax loss 292 mln stg vs 52 mln stg profit

* Sees FY revenue 1 bln stg lower

* To cut another 1,200 jobs next year

* Decline in business traffic slows

* Shares 6 percent higher, top FTSE 100 gainer

(Adds analyst comment, updates shares, details)

By Rhys Jones

LONDON, Nov 6 (Reuters) - British Airways (BAY.L) signalled business is stabilising, eclipsing news of a worse than expected first half loss and a prediction that revenue would slump by 1 billion pounds ($1.7 billion) this year.

Shares in the company jumped as much as 8 percent, making it the biggest gainer on the FTSE 100 index .FTSE, as the company also said revenue from business travellers was back at pre-credit crunch levels by one industry measure.