https://techcrunch.com/2021/04/05/flight-penguin/

Hipmunk’s founders are building a successor to their now-defunct flight search service.

The startup was acquired by SAP-owned travel and expense platform Concur in 2016, and its CEO Adam Goldstein departed in 2018. But Goldstein told me he and his co-founder Steve Huffman (also co-founder and CEO of Reddit) were still disappointed when Concur shut the service down at the beginning of last year.