Context: Conventional ("tailhook") aircraft rely upon a landing signal officer (LSO, radio call sign paddles) to monitor the aircraft's approach, visually gauge glideslope, attitude, and airspeed, and transmit that data to the pilot. Before the angled deck emerged in the 1950s, LSOs used colored paddles to signal corrections to the pilot (hence the nickname). From the late 1950s onward, visual landing aids such as Optical Landing System have provided information on proper glide slope, but LSOs still transmit voice calls to approaching pilots by radio.

Question: What does LSO stand for?
Answer: landing signal officer

Question: Who does a conventional aircraft rely upon to moniter the aircraft's approach and transmit the data to the pilot?
Answer: a landing signal officer

Question: What did LSO's use to signal corrections to the pilot prior to the angled deck designs introduced in the 1950's?
Answer: colored paddles

Question: Which visual landing aids have provided information on proper glide slope since the late 1950's?
Answer: Optical Landing System

Question: What are LSO's still being used to do?
Answer: transmit voice calls to approaching pilots by radio

Question: What does OSL stand for?
Answer: Unanswerable

Question: Who does a non-conventional aircraft rely upon to moniter the aircraft's approach and transmit the data to the pilot?
Answer: Unanswerable

Question: What did LSO's use to signal corrections to the pilot prior to the angled deck designs introduced in the 1960's?
Answer: Unanswerable

Question: Which visual landing aids have provided information on proper glide slope since the late 1940's?
Answer: Unanswerable

Question: What are LSO's no longer being used to do?
Answer: Unanswerable