Nervous about long flight

Hi all,

Been lurking for a while, and this is a great sub--I really appreciate everyone, especially the aviation professionals here. Right now I'm taxiing on DL0115 from JFK to EZE...very excited about the trip but always nervous about a long flight. The captain just said it should be a nice first half but the second half could be bumpy, which of course should reassure me (they obviously know what they are doing) but made me nervous. Any tips?