When organizations don't have enough air volume to earn negotiated discounts, many find small business programs are better than nothing. But they can be a bit more than that. They can, for example, fill gaps for midsize companies averse to contracts with multiple carriers. For airlines, these programs offer access to a fertile segment at costs below those of traditional discount programs. Several carriers now are tweaking their programs to better address this market.

Delta is changing its SkyBonus program to reward the biggest of its smaller-spending business customers but also disqualify the smallest. JetBlue is poised to . . .

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