Every platform has this problem. Ycombinator even asked explicit to come up for ideas for this problem.

This being said, your idea is not new https://www.traveltechnation.com/companies/piggybee

Yep I'm aware of PiggyBee, they actually shut down in 2022. Grabr is still around but international only, and focused on shopping. Part of why I think theres room here, especially for domestic/regional routes that the bigger players ignored. BTW I never said the idea was new.