Delta Air Lines CEO Ed Bastian said Tuesday it’s “very hard” to mandate people be vaccinated against COVID-19 to travel domestically because the shots aren’t yet fully approved. The Atlanta-based carrier has no plans to require that passengers of domestic flights be vaccinated, he told CNBC. “It’s very difficult for us to come in and mandate a vaccine that isn’t even federally approved yet. The authorization hasn’t been final yet, so stay tuned,” Bastian reportedly said.