You might think this post is about electrical matters, continuing to pander to zb, but it isn't. It's about the myriad things that might disrupt ones schedule in aviation. Flight delayed for weather: common. For maintenance: you bet. Because the client was late or changed their mind: that's why they're the ones that pay the bills. Frequently fuel is not available when you want it. Sometimes the pilot is sick. Sometimes the airport or airspace is closed for an airshow, or a security event. I've had required equipment not arrive in time for the flight. It is not uncommon for me to check out of and back into the same hotel three times on three consecutive days because that day's flight keeps being scratched.
I knew I hadn't seen it all, but today was a new one for me. The planned flight was cancelled because of an AC/DC concert at destination. What did that have to do with anything? There were no hotel rooms available.