Flying Carpet is a cross platform application which will enable wireless, and encrypted, transport files between different devices. Not required network infrastructure (access point, router, switch).
You can use two computers (with Mac, Linux or even Windows) that have wireless connection (wireless chip) and are located nearby.
Don't have a USB? You don't have access to any wireless network or do you have but don't trust it (is it public etc)?
Need to transfer a file larger than 2 GB between different systems, but do not want to create a network?
Try the app, it is free and you can download it from Github for the platform you are interested in.
https://github.com/spieglt/FlyingCarpet/releases