At 7:15, a pair of them, Khalid al Mihdhar and Majed Moqed, checked in at the American Airlines ticket counter for Flight 77, bound for Los Angeles.
( ( At 7:15 ) ( , ( ( ( ( ( ( a pair ) ( of them ) ) , ) ( Khalid ( al ( Mihdhar ( and ( Majed Moqed ) ) ) ) ) ) , ) ( ( checked ( in ( at ( ( ( ( the ( American ( Airlines ( ticket counter ) ) ) ) ( for ( Flight 77 ) ) ) , ) ( bound ( for ( Los Angeles ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (CD 7:15))) (, ,) (NP (NP (NP (DT a) (NN pair)) (PP (IN of) (NP (PRP them)))) (, ,) (NP (NNP Khalid) (NNP al) (NNP Mihdhar) (CC and) (NNP Majed) (NNP Moqed)) (, ,)) (VP (VBD checked) (PP (IN in) (IN at) (NP (NP (DT the) (NNP American) (NNP Airlines) (NN ticket) (NN counter)) (PP (IN for) (NP (NNP Flight) (CD 77))) (, ,) (VP (VBN bound) (PP (IN for) (NP (NNP Los) (NNP Angeles))))))) (. .)))
Khalid al Mihdhar and Majed Moqed checked in at 7:15.
( ( Khalid ( al ( Mihdhar ( and ( Majed Moqed ) ) ) ) ) ( ( ( checked in ) ( at 7:15 ) ) . ) )
(ROOT (S (NP (NNP Khalid) (NNP al) (NNP Mihdhar) (CC and) (NNP Majed) (NNP Moqed)) (VP (VBD checked) (PRT (RP in)) (PP (IN at) (NP (CD 7:15)))) (. .)))