Go Fly did STN-LIS without success and AB Airlines did LGW-LIS, TAP also now do LGW-LIS aswell as LHR-LIS, BA no longer do LGW-LIS, I think it has to do with airport fees and subsidies to TAP.
There are no subsidies to TAP. There were in the past (4 or 5 years ago) under a recovery plan authorized by the EU Commission. Since then the portuguese government is no longer authorized to give any subsidie to TAP. And guess what..... In a tough market, with events like 9/11, SARS, Economic ressession, etc. and with a strategy to improve the profitable routes like Brazil and Africa, TAP made a profit in 2003. More, what was paid in taxes over this years is more than the subsidie received.
Next time, inform ourself better before making this type of comments.