It sure seems like Nancy and friends like to fly on the US Military's dime. Attached are screens captures from the US House of Reps - Office of the Clerk, Foreign Travel Reports.
Cheatsheet on footnotes:
\1\ Per diem constitutes lodging and meals.
\2\ If foreign currency is used, enter U.S. dollar equivalent; if U.S. currency is used, enter amount expended.
\3\ Military air transportation.
Pay special attention to the (\3) in the transportation column. This denotes they are flying on the US Military's dime.
Sauce - http://clerk.house.gov/public_disc/foreign/index.aspx