There are many similarities between the former domestic FAA flight plan format and ICAO. However, when it comes to aircraft equipment suffixes, there are some major differences. The ICAO format requires a wake turbulence category based on the aircraft. ICAO also has more specific coding for transponder equipment, which specifies ADS-B Out and In, for example, and avionics installations, which includes several additional codes for avionics capabilities such as LPV approaches. The more detailed codes can be included to provide more information for ATC, but they are not required. The ICAO format also includes codes for emergency equipment, which will be helpful in search and rescue situations.