Originally Posted by WineCountryUA

Doubtful for many of these cases -- just a case of maximizing equipment utilization and meeting some positioning requirements.

Depends on what other uses you might reduce and how hard you want to push the utilization factor.

Once you make a route p.t.s. it is a commitment to have lie-flat and equipment swaps away from lie-flat become a problem.

So to add another route with 3-4-5 daily frequency using lie-flat would be difficult unless UA reduced frequency on other routes.