From Travelocity:-
<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Fare Rules
Fare details for NLXNNGB
COMBINATIONS
CONDITIONS APPLICABLE TO ROUND TRIP/CIRCLE TRIP/SINGLE OR DOUBLE OPEN JAW - -MAY BE COMBINED WITH ANY ONE WAY/ROUND TRIP FARE GOVERNED BY ANY RULE IN ANY TARIFF VIA BA. -MOST RESTRICTIVE CONDITIONS APPLY. ADDITIONAL CONDITIONS APPLY ROUND TRIP - -PERMITTED. CIRCLE TRIP - -PERMITTED. OPEN JAW - -SINGLE OPEN JAW PERMITTED AT EITHER ORIGIN OR DESTINATION. DOUBLE OPEN JAW PERMITTED. END-ON-END - -PERMITTED WITH DOMESTIC FARES. -COMBINATIONS WITH THIS FARE MUST BE SHOWN SEPARATELY ON THE TICKET. -PERMITTED WITH BA INTERNATIONAL FARES. -COMBINATIONS WITH THIS FARE MUST BE SHOWN SEPARATELY ON THE TICKET. -CONDITIONS APPLY TO ALL FARE COMPONENTS OF THE JOURNEY. -TRAVEL MUST BE VIA THE FARE COMBINATION POINT. CO-TERMINALS - -THE FOLLOWING GROUPS OF CITIES ARE CONSIDERED TO BE THE SAME POINT NYC - EWR.</font>