Delta Air Lines Inc. will begin four daily flights between Philadelphia and New York's LaGuardia airport on July 11 as part of an expansion in New York because it is swapping some takeoff and landing rights with US Airways Group Inc.

Delta will operate flights from here to New York at 7 a.m., 10:45 a.m., 2 p.m., and 5:45 p.m., and flights leaving LaGuardia for Philadelphia at 9 a.m., 12 noon, 4 p.m., and 8:05 p.m. daily.

Delta said Friday it will spend $100 million to expand LaGuardia's C and D terminals, which will be connected by a 600-foot bridge.

Delta is gaining 132 slots at LaGuardia, now used by US Airways. In return, US Airways will get 42 Delta slots at Washington, D.C.'s Reagan National airport, as well as rights to fly to Sao Paulo, Brazil, in 2015, and $66.5 million in cash. US Airways will announce its plans for expanded Washington flying in January.    - Linda Loyd