I do not know this needless to say, but it's my understanding that US citizens are exempt from being forced to get yourself a German transit visa, provided that you stay in the Global Transit Region, that is Terminal one, specifically within the A/Z and B/C concourses, and Terminal 2, inside the D/E concourses. This is able to apply to you because

Evidence of employment. An authentic signed letter from an employer or current payslip. Along with the financial institution statement, you will need to also existing your work contract as well as a vacation affirmation from your employer, stating the dates you might have requested off from do the job and when you find yourself envisioned to return

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