That's what modern drone aircraft are.
They cost more than 55k because of inflation, but also because the sensor systems satellite uplink etc are a large chunk of the overall costs. Still at 4Million a pop the MQ-1 Predator's are cheap. https://en.m.wikipedia.org/wiki/General_Atomics_MQ-1_Predato...
It's successor is 16 million but it's larger and "An MQ-9 with two 1,000 pounds (450 kg) external fuel tanks and one thousand pounds of munitions has an endurance of 42 hours."