I traveled a few times during TN status. Everytime I DON'T turn in to airline. I keep it. After I'm back to US, I filled a new I-94, hand to CBP officer with old I-94 (TN), the officer will write down same info on new I-94, and retain old I-94.
When you leave N America you are supposed to give up your I-94, plain and simple. If you don't, even for good reason (like to prove your TN status upon return) they will usually make you fill in a new one.
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