Operating Costs: Add to existing vs starting new route?

[rybob1]

Are there cost advantages to opening up an additional frequency on an existing route versus opening a new route?

For instance, If I run for example JFK-LAX 2x daily, and I am looking at either starting a 3rd time daily JFK-LAX or open 1x JFK-SFO, which option is going to give me the greatest cost savings?

It would seem that if I run an additional frequency on an existing route, that my costs would be lower, if for nothing else, staff would be in place at both airports already.

[Sami]

It has no noticable differences, but for other reasons (marketing, route image) I would suggest to add another freq. to existing destinations if there is demand for that.