The flight attendants and other passengers were not wearing masks, meaning this was to a destination, not requiring masks, per your customer-facing page, so no masks of any kind would be required.
(she is Director of Corporate Communications Delta Air Lines), trying to "create a truly trusted and loved consumer brand in our customer’s mind," telling customers that there is no required type of mask?
As you can see below. So, is it any wonder they found surgical masks equivalent to N95s?
And their study continues to be weighed very heavily in the systemic reviews, resulting in surgical masks being used by the medical community, instead of N95's.