Partial payment from air-gapped cold wallet?

A while back I set up a cold wallet on an old air-gapped laptop. At the time I thought "I'll figure out how to spend from it later.".

Now it's later.

How can I safely make a partial payment, while keeping the laptop isolated?

submitted by /u/htvwls
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from Bitcoin - The Currency of the Internet http://bit.ly/2VI3lFz