Both are recorded (by pen and paper) at the start and end of each flight. The block time is what I enter in my logbook. From FAR Part 1: § 1.1 General definitions.
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Pilots often use Hobbs time to log flight time, as it is seen as a more accurate measure than tach time. This is related to the fact that the engine of a general aviation aircraft will be running at different RPMs at different stages of the flight.
You will, however, have to perform some mental math or use a calculator when making logbook entries using this format; Each decimal hour (0.1) is equal to 6 minutes, which means your flight minutes will have to be divided by 6 to obtain decimal hours (e.g., a flight of one and a half hours (1:30) = 1. [30/6] = 1.5).
The tach on the other hand registers engine time and as an owner I don't care much about Hobbs time for maintainence, I use the tach. It reads revolutions and that is how the manufacturer of the engine sets TBO and other time related maintainence.
(1) A person may log instrument time only for that flight time when the person operates the aircraft solely by reference to instruments under actual or simulated instrument flight conditions.
Cross-country time is defined in§ 61.1 (b )(3)(ii) as time acquired during a flight that is conducted in an appropriate aircraft; that includes a point of landing that was at least a straight-line distance of more than 50 nautical miles from the original point of departure; and that involves the use of dead reckoning ...
To answer the original question no, you cannot log flight time as a passenger in an aircraft. AOPA's website has a pretty good answer. The PIC is, by Federal Aviation Regulations (FARs), responsible for the safe operation of the flight (FAR 1.1, 91.3).
Trajectory-based operations (TBO) is an air traffic management (ATM) method for strategically planning, and managing flights throughout the operation by using time-based management (TBM), information exchanged between air and ground systems, and the aircraft's ability to fly trajectories in time and space.
Generally the logbook entries are not checked, however, the consequences of false entries being detected are severe-you will be fired from a piloting joib and likely have your pilot's license suspended or revoked.
It takes two months to become a pilot and earn your private pilot license. To become an airline pilot, it takes two years to gain the required 1,500 hours flight time.
In commercial aviation, this means the time from pushing back at the departure gate to arriving at the destination gate. Air time is defined as the time from the moment an aircraft leaves the surface until it comes into contact with the surface at the next point of landing.