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Since all the tech (including the airship engines I assume) runs on mana, then in addition to bowlturners ideas, you could limit speed by the need to "refuel". I'll have to make a few assumptions ...
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#1: Attribution notice removed
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System
·
2021-03-30T23:53:15Z (over 3 years ago)
Source: https://worldbuilding.stackexchange.com/a/30717 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/