If you book them as separate
itineraries on different airlines, however, beware: If one leg of your trip is delayed and you miss your second flight, the airline will have little sympathy for you.
Not exact matches
One compelling reason to use an OTA (and something I've found Orbitz particularly helpful for over the years): when you're trying to put together a more complicated
itinerary... especially when you'll need to book a few
different flight segments
on a few
different airlines.
For people trying to put together a round the world
itinerary with a lot of one way business or first class segments
on different airlines, 100,000 AA miles can be a nice asset.
As you explore the exact
itineraries offered
on different dates you might be able to predict from the calendar which
airline is being offered just by looking at the fees.
On a round - trip
itinerary between
different regions, United
Airlines allows a stopover and two open - jaws.