"Draught" or "draft"

orthography

They're just alternative spellings, which overall occur about equally... enter image description here

Americans usually spell it draft - here's the chart for American-only usage... enter image description here

Brits usually use draught - here's their usage chart... enter image description here

EDIT - Apologies for including yet another chart, but even though they really are just alternative spellings, predominantly associated with the US/UK divide, I find this American-only usage chart for draft/draught of ale particularly interesting... enter image description here

I assume Americans see ale as an old-fashioned Britsh word, so they slip into "mock-archaic" spelling (similar to Ye Olde Tea Shoppe ). I'll refrain from adding another chart, but conversely even Brits prefer working draft over working draught, because this is a much more recent "set phrase" primarily associated with Americans.

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