Since you are going there anyway, it never hurts to have
some options in the way of entertainment or lodging.
Package Deals are most commonly associated with Vacations
and can include anything from Coupons to VIP passes.
Las Vegas builds amazing hotels and rides all the time and
one way to promote a new hotel or an attraction is to
include it in some kind of package deal.
Another type of package deal can happen if you are buying
many tickets at once. You might be in charge of this for a
business or just have a very large family but often you can
get a group package deal.
Airlines like groups because they spend money in the
airport and in the plane and if they have a good
experience, they will likely tell someone about it. This
all leads to greater revenue in the long run even if the
airline loses a little profit at first.