Vaccine compositions useful for vaccination against a target influenza strain, and method and kits for using the same. The vaccines comprise a live attenuated influenza virus that is synthetically constructed based upon a backbone platform derived from a bat influenza strain, and heterologous surface proteins HA and NA derived from the target influenza strain. The live attenuated virus is non-reassortant with native, circulating influenza strains, and can be used to create vaccines for humans and other animals.