After massive consolidation in both flights and airlines, it's positive to see a new budget airline emerge. ZIPAIR is fully owned by Japan Airlines (JAL) so it has good financial backing and hopefully will be around for a while. This started as cargo-only airline in 2018 and started their passenger services in October of 2020 during the pandemic. They have been expanding thier passenger services ever since with 5 routes to choose from: Singapore, Seoul, Bangkok, Honolulu and LA. I have been seeing some good deals from LA to Tokyo, which is nice since flights to and from Japan tended to be priced high (with the exception of FlyCebuPacific's budget air route from Manila to Osaka.)
There is a myriad of different travel regulations, which change often. So be sure to do your homework before booking your tickets as only citizens and permanent resident visa holders can currently enter Japan at time of writing. Transiting passengers are not allowed according to ZIPAIR's website, but when restriction ease, they can be used to reach connecting cities in Asia. At this point, any expansion of routes (especially by budget-airlines) is a good sign for travel.