During a crisis, business travelers don't always check in with their companies when requested to do so. That may result from complacency or ignorance to corporate policies. Perhaps their phones are lost or not working. Travelers might have booked outside designated channels and their employers don't know where they are — or even where they should be. Or maybe they really are in trouble. To help close the loop, American Express Global Business Travel is putting an old idea into action: examining very recent credit card transaction . . .