Most overnight flights provide airplane blankets to customers. However, there is no guarantee that the free blanket will be available to those in coach. Airplanes are also notoriously cold. Depending upon your seat, you could feel a draft throughout your flight. For women, consider buying an inexpensive pashmina to serve as a blanket, pillow, or wrap (for chilly restaurants) – it is a multi-purpose piece that is great for traveling. Be prepared and keep a travel blanket in your carry on bag- just in case!