Halachos for the Traveler. By Rabbi D. Epstein

"This compact, comprehensive work addresses the specific problems that come up while on the road or in the air.
It provides clear, detailed answers as well as a valuable collection of notes and extensive halachic sources
Also included are Birkas Ha-Mazon, Minchah, Maariv, and Tefillas Ha-Derech, making this useful pocket-size book the perfect traveling companion."