What are some aspects of business travel that startup leaders absolutely must invest in to help their companies in the long run?

Almost every traveler has an opinion about what’s worth the splurge, from programs like Global Entry to more indulgent items like upgrades and private guides. But unlike individual travelers, a company can’t use a single nice suitcase or pair of comfortable shoes for all its employees’ subsequent trips, so what should a business spend money on to make travel as productive, painless, and cost-effective as possible?

Here are my top five ideas:

1. Time

The old adage is true — saving time means money in business travel. An extra hour spent working is more useful than spending that hour in the back of a taxi or...