Shake Shack told Fox News Digital the price change was caused by a technology error and that charging customers more for declining to tip is not company policy. The airport location is owned and operated by HMSHost, a Shake Shack licensee. "We'll continue working with all our licensed partners to make sure every guest is taken care of at Shake Shack," the spokesperson added. "Because I had been to that Shake Shack before, it felt fishy to me, but honestly, I did not know," Powell said. "I mean, the reality is, I've even tipped at that Shake Shack before.