No it isn't. The air gapped PC has no idea about your past transactions so it can't create a spending tx. What you should do is go online since you are using a trezor and it is designed for online use. Otherwise you could try creating a watch only wallet with your mpk (wallet menu > information) on an online system and doing the
whole cold storage sneaker net dance. But it makes no sense to own a trezor and then keep it offline as well. Why spend on a trezor if you don't want the convenience and security of being able to use it on an online system?
Thanks for the response. And no..this has nothing to do with past transactions at all.
What I want to do is.
Use a wallet to tie into my trezor BTC and get a signed transaction (hexadecimal string) for sending BTC to an addy of my choice. ALL OFFLINE
Then carry that HEX STRING with me in an email and when ready to SPEND or BROADCAST it I can, without carrying the BTC on my cell phone hot wallet, example Mycellium.
So if I ever lose my phone or if it is ever hacked the worse case scenario is that Hex string is exposed and if it is used will only send the BTC to the addy it was intended to.
It makes losing BTC virtually impossible.
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