Yes, but commercial airliners aren't built with plugs and sockets. For weight savings, everything is directly hardwired.
So they've managed to skim off maybe 10 pounds off the design of the aircraft, saving some several thousands in fuel costs over the operating life of the aircraft. A reasonable tradeoff considering the chance of the aircraft catching fire and then exploding when it hits the ground, killing everyone on board. *sips tea* Yeah. Makes sense to me. I mean, what's the cost of settling an accidental death claim for 300 people?
Here comes the math!
The cost of failure:
A product defect typically weighs in at $2.1 million USD per. So assuming 300 passengers and 10 crew, that's $651 million payout per plane going pop.
The cost savings:
Now, a 747 at least uses a gallon of fuel per second, or about 5 gallons per mile (average) on a flight. A typical domestic flight is about 2.5 hours in flight time, or 9,000 gallons of fuel. The weight of the aircraft, empty and unloaded, is about 95,000 pounds. It has 171 miles of wiring. Let's assume that we want to add connectors every 100 feet; That gives us 902,880 connectors. The average weight of a connector we'll say is 1.5 grams. that gives us 1,354,320 grams of extra weight to add connectors, or about 25,031 pounds.
So to add all those extra connectors would add an extra 26.3% cost to fuel. Now, the Dreamliner is slated to have a service life of about 30 years. We don't know how many pressurization cycles that equates to, but we can make an estimated guess. Let's just say 2 flights per day, 5 days a week. That'll be 1,560 flights before retirement then.
The average domestic flight is around 700 miles, we'll say. If the fuel cost before modification is 5 gallons per mile, at $3.30 per gallon... the cost of fuel per flight is $46,200. With the modification, it would cost $57,750.
Fuel cost over life of vehicle (before mod): 72,072,000.
Fuel cost over life of vehicle (after mod): 90,090,000.
Cost on failure: $651 million
Failure rate cutoff: 1 in 36
In other words, if a catastrophic failure that could have been prevented with electrical connectors happens more than 1 out of 36 planes, it's worth it. Otherwise, it's not.