How should FL 304 be verbally communicated in ATC?

The proper way to verbally communicate flight levels in air traffic control is to use the format of saying "Flight Level" followed by the altitude in hundreds. In this case, FL 304 is expressed as "Flight Level Three Zero Four."

When dealing with flight levels, each digit is articulated separately for clarity. This helps to avoid any misunderstanding, especially where radio communication is concerned, which may be affected by static or other types of interference. Saying "Three Zero Four" clearly indicates both the hundreds and the tens place values, ensuring that the pilots and controllers have a mutual understanding of the altitude being referenced.

The other choices do not accurately represent FL 304 in the correct format. For example, "Flight Level Two Hundred and Four" incorrectly identifies the flight level, while "Flight Level Three Hundred and Four" miscommunicates the level by missing the middle digit. "Flight Level Thirty Four" is also an incorrect representation as it simplifies the altitude without proper articulation of the entire number. Thus, the choice that follows the established communication standard is the correct one.