The best replacement for hot air balloons is blimps.

The best alternatives to hot air balloons are rated as following:
★★★★★  blimps

Your alternative for hot air balloons is not listed? Suggest!
Speaking about hot air balloons, one probably shouldn't forget about buoyancy.

Other search terms related to hot air balloons and their ratings are:
★★★★★ buoyancy
You have in mind a companion for hot air balloons and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of hot air balloons in all years. Click on graph for more.
hot air balloons
blimps