A Delta Air Lines jet takes off from Reagan National Airport. (JONATHAN ERNST/REUTERS)

The current Delta Shuttle schedule has flights leaving Reagan  National Airport (DCA) for LaGuardia Airport (LGA) every hour on the half-hour mark between 6:30 a.m. and 7:30 p.m. during the week. Flights from LaGuardia to National also depart every hour on the half-hour between 6:30 a.m. and 8:30 p.m.

The new schedule, which goes into effect on Sunday, creates earlier and later departures for passengers flying between National and LaGuardia.

Flights will leave LaGuardia for National each hour on the hour between 6 a.m. and 9 p.m. And flights will leave National for LaGuardia every hour on the hour between 6 a.m. and 8 p.m., with two exceptions: A flight from National to LaGuardia will also leave at 6:30 a.m. and no flight will head that way at noon.

This means that passengers can now leave half an hour earlier, at 6 a.m. rather than 6:30 a.m., while local travelers can board flights from LaGuardia to National at 9 p.m. instead of 8:30 p.m.

Delta Shuttle flights also currently leave every half-hour on the hour during the week between LaGuardia and Boston Logan International Airport (BOS), while there are 11 flights on weekdays between LaGuardia and Chicago’s O’Hare International Airport (ORD). The new schedule has flights between LaGuardia and Boston leaving on the hour, while the number of flights between LaGuardia and O’Hare will increase to 13.

You can see the new schedule here.

The new departures stem from Delta’s New York expansion, which the airline says will significantly increase service at LaGuardia airport.