The New York-London air corridor is one of the most competitive routes in the world.

Yet the major airlines remain so desperate for any and all revenue that they continue offering loss-leader fares on many competitive routes.

These competitors said they thought any further relaxation of Saturday-night-stay requirements would be temporary and limited to highly competitive routes.

This week, United and several competitors also extended special discount fares intended to attract business fliers on highly competitive routes.

The new rates will make Greyhound's full coach prices more comparable to airlines' discount rates on highly competitive routes.

FlexSearch easily digs out and displays these fares on those highly competitive routes for easy comparison, he said.

Some industry executives, however, say air traffic across the North Atlantic, the most competitive international route, is quite weak.

At the same time, "the cost of domestic first-class fares is plummeting" on many competitive routes, he said.

But the most competitive routes, like Chicago to New York, might already have lower prices on other airlines, especially low-cost carriers, he said.

The plan will have little effect on highly competitive overseas routes, like New York-London.