After making a "modest" investment in corporate sales during the past 10 years, Southwest Airlines expects to significantly increase its numbers. It's also taking a fresh look at its toolkit and contemplating ways to make bookings more efficient.

Southwest started 2017 with 18 field account managers. Senior director of business development Matt Smith, who leads corporate sales, said he expected a team of at least 30 by the end of 2018. This means smaller territories . . .

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