It's a classic tale of challenges and opportunities. And disclaimers.

For when the three biggest travel management companies help clients use Airbnb, they say, they're not endorsing it. Whether to use it is up to clients. TMCs are simply capturing data. Well, they might be marketing it, too. And they could soon be booking it. In any case, it will generate revenue.

According to an Airbnb spokesperson, TMCs will make money through "revenue-share deals for company referrals and booking fulfillment." The representative said some such arrangements are already in place.

American Express Global Business Travel, BCD Travel . . .

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