Airplanes have ADS-B, which is quite similar to the maritime AIS location broadcasting. The only significant difference is that satellite AIS coverage is high and ships don't go fast, so having no signal for a few hours is not as big a problem for ships.
ADS-B satellite coverage is currently provided by (at least) the iridium constellation, but that only came into effect in 2016.
Airplanes have ADS-B, which is quite similar to the maritime AIS location broadcasting. The only significant difference is that satellite AIS coverage is high and ships don't go fast, so having no signal for a few hours is not as big a problem for ships.
ADS-B satellite coverage is currently provided by (at least) the iridium constellation, but that only came into effect in 2016.