For those of you who are PBB subscribers, you will recall that when Frontier Airlines announced their “shuttle” service between LAX and San Francisco last year, we were not big fans of the idea. Too much competition, not enough market “heft” for Frontier to pull it off.

Today, the airline sent a note to employees telling them that the LAX/SFO shuttle service will be discontinued on July 10.

Just one year and about 10 days after they started it.

Frontier Airlines is, reluctantly, on our PBB Titanic Watch. We put airlines on the list that we feel are in either strategic or financial difficulty.

Ticker: (FRNT:Nasdaq)