Delta is changing how it boards passengers starting May 1

Delta Air Lines is changing its boarding process beginning May 1 in an effort to speed up loading passengers onto planes. 

If you're flying on the airline, you'll have to know what zone number you're in to board in the correct sequence. 

That's because Delta is introducing numbered boarding zones for all flights, meaning that customers will have a zone number assigned to them instead of boarding groups labelled by airline status or fare class, such as "Sky Priority." The airline stressed that boarding orders will not change, but the group names will.