Delta might be a bit more popular than Brex. We know about 1 link to it since March 2021 and only 1 link to Brex. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Nerdwallet has a pretty good comparison chart for secured business credit cards. You'll find many of them with cash back rewards, but I haven't seen any with flight rewards though. You can also build business credit with regular credit-that-works-like-debit cards from Brex, Dappr, and several others. Source: about 1 year ago
The one with getdelta.io is different, it returned HTTP 404, which "indicates that the origin server did not find a current representation for the target resource or is not willing to disclose that one exists.". Source: about 1 year ago
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