Atlanta airport loses power, trapping travelers in planes and terminals

The construction company would likely be liable in the end, with their liability insurance paying. If they properly arranged for utility location services and those failed to mark the conduit then that service might have liability instead.

Other non-liability insurance policies might apply as to the airport and airlines and would presumably have subrogation rights against the liable party.

An acquaintance of mine works for a high precision concrete paving company. The specialize in airports and data centers.

Their contracts often specify a penalty rate for important data cables. Sometimes this would be $120,000 per minute that the cable is down. I think it was even an order of magnitude higher for some cables when they were working near Amazon’s data centers in Northern Virginia.

Given that it would usually take two hours for a cable to be repaired, a single hit would be millions to tens of millions of dollars in fees.

This resulted in a NASA like level of paperwork, checklists, and team communication before anyone so much as put a shovel into the ground on the worksite.

I'll answer your question with another question: how much money did they lose because of this power outage?

Until the money lost is greater than the costs associated with adding redundant, backed up power supplies, they probably won't be added.