And the more massive an object, the more energy required to change its direction.
Long-term road maps
Southwest—unlike most other airlines, which fly multiple aircraft models—flies only Boeing 737s. As a result, every Southwest pilot, flight attendant, and ground-crew member can work any flight. Plus, all of Southwest’s parts fit all of its planes. All that means lower costs and a business that’s easier to run. They made it easy on themselves.
When we launched Basecamp, we didn’t even have the ability to bill customers! Because the product billed in monthly cycles, we knew we had a thirty-day gap to figure it out. So we used the time before launch to solve more urgent problems that actually mattered on day one. Day 30 could wait.