With all of the "encouragement" (doom and gloom) that Harry has been given I'm surprised that he even got on the plane!
Its all good Harry. When you fly with any of the major airlines you are in the care of a highly skilled and rigorously trained group of professionals. The qualifications and competition to get hired on with a major airline is intense - especially for the pilots.
The planes are more dependable now than they have ever been and are equipped with redundant safety systems. Every significant failure of a system is reported to the FAA and those that show a trend are rectified and a fix applied to correct the problem.
If something does go wrong, the crew is not alone with the problem - they have a team of skilled ATC (Air Traffic Contol) controllers and company dispatch personell to help them cope with the problem and get the aircraft safely on the ground.
About the only thing I don't like about flying now is the airlines have restructured their flights to maximize their passenger load factors per flight. In this era of narrow profit margins you won't find a flight with a lot of empty seats on it anymore - they're all packed pretty tight, which means you're almost always trying to share an armrest with somebody.
BTW don't worry about someone trying to open the cabin door inflight as it is virtually impossible to do so. Watch when they close the door - it is pushed sideways into the cabin, turned parallel to the cabin side and then pushed into place against the seal and locked. In flight the cabin pressure pushes the door against the frame to compress the seal tight. Even Arnold Schwarzenegger in his prime couldn't get that door open against the cabin pressurization.
So Harry, don't worry too much about getting on the plane as you are in the care of a dedicated group of professionals who are highly skilled in what they do each and every day.