I don't know if its obscure, but it is (was) interesting...
Asian Spirit - a Filipino airline, subsequently called Zest Air and now called AirAsia Zest.
A few things stand out with my experiences....up to my first flight with Asian Spirit in the early 2000's I'd only ever flown 1 Fokker 27 with East West Airlines (when I was about 10) and a handful of Qantas B767's. So getting onto a NAMC YS-11 - a Japanese plane from the 1960s, was interesting. It had no overhead lockers...just a hat rack! Flight was from Manila to Baguio....Baguio Airport is at 1296m, with deep ravines at either end of the runway
The next flight was on an unbranded Asian Spirit LET-410...and the most memorable thing on this occasion was the guy standing near the left engine with a fire extinguisher whilst it started. If there was an issue with fire...I doubted the little extinguisher would have helped - so that wasn't really confidence inspiring!
The next flight was on a DHC Dash7 - a really cool plane...but also the first time I experienced significant misting inside the cabin....I didn't know it was normal at that time!
One of the last flights with them was on a BAE ATP - very modern compared to the rest of their fleet.
All good experiences in hindsight...I'm glad I got to fly on them
Asian Spirit was locally know....get on Asian...get off a Spirit
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I was quite amused to find out they later got sold/re-branded to Zest Air....as the Zest-o Corporation was involved via the new owner (who owned Zest-o and was co-branding the airline to match that business name)...and they made popular juice pouches!