not optimistic
Unfortunately, things do not look good for Frontier. I do think it will be very hard for them to compete with Frontier. It is not really a matter of whether they can keep up their market share. It is really a matter of what revenue they can get from their seats. Frontier has previously competed by offering a substantial discount to UAL fares. However, their fares were substantially higher than typical SW fares. It does not seem likely at current fuel costs that they can match SW on fares and still turn a profit. If it is war of attrition, SW has big pockets, and will easily win.