Builders Jetpack is the ideal jetpack mod for building.
The jetpack let's you fly at the cost of fuel, consuming more fuel if you are flying faster. To start/stop flying, double tap space. Fuel is shown as percentage in the action bar, and can be inserted into the jetpack by right clicking the jetpack fuel item.
When flying, the jetpack emits smoke particles below: 
You can craft the jetpack itself using 1x copper ingot, 2x copper block, 2x firework of any type, and 1x netherite chestplate in this shape: 
You can craft the jetpack fuel item using 1x lava (the bucket will be returned), 2x gunpowder, and 1x leather. This recipe is shapeless. 
