How we know

"Southwest Airlines came to HireInfluence wanting to create awareness and drive pre-sales tickets for the airline's first-ever flights to Hawaii."

Who says so	HireInfluence, the agency. Influencer Marketing Hub independently repeats the same result figures, so the outcome is corroborated outside the agency's page. Read it
A second source	Influencer Marketing Hub trade article independently cites the same 56 million impressions, 3 million engagements and 0.03 dollar cost per engagement for the HireInfluence Southwest Hawaii campaign.
What the agency was asked to do	"Southwest Airlines came to HireInfluence wanting to create awareness and drive pre-sales tickets for the airline's first-ever flights to Hawaii." (HireInfluence case study)
How the agency was picked	Brand approached the agency
How that happened	Not published. Inbound (agency content/reputation) implied. HireInfluence's own case study page says only, verbatim, 'Southwest Airlines came to HireInfluence wanting to create awareness and drive pre-sales tickets for the airline's first-ever flights to Hawaii,' which reads as the brand approaching the agency but does not say whether that was a pitch/RFP, referral, or prior relationship.

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Every case here carries the one link that proves it, and names who said it. Where that is the agency describing its own win, the card says so rather than hiding it. Cases where nobody ever documented a reason are not on this page at all. Brought to you by Influencer Advisory, your influencer marketing partner for supplement, health and beverage brands.