AKRON, Ohio -- The pilots of the plane that crashed in Akron killing all nine on board acknowledge the aircraft's rapidly decreasing speed as they prepared to land at an Akron airport about four miles away.

Flight instructors interviewed by the National Transportation Safety Board said that large wing flaps opened as part of the landing process were likely opened too wide as the plane approached the airport. One told investigators it would "be nuts" to open the large flaps so soon.

The new details and interviews are contained in some 1,100 pages of the NTSB's investigation of the Nov. 10 crash. The report, released Wednesday, does not contain an analysis of the investigation or determine what caused the crash. The cause will be determined in the coming months.

The Hawker 125-700 twin-engine charter, owned by Augusto Lewkowicz of Execuflight in Fort Lauderdale, Florida, crashed into an apartment building in the 3000 block of Mogadore Road killing the two pilots and seven passengers.

The passengers worked at Pebb Enterprises of Boca Raton, Florida. The real-estate company was scouting new locations for shopping centers. They were flying to Akron Fulton from Dayton-Wright Brothers Airport. No one on the ground was injured.

The plane's captain -- Oscar Chavez, 40, of Miami, Florida -- performed the duties of a second-in-command while the co-pilot, Renato Marchese, 50, of Boynton Beach, flew the plane. Typically, co-pilots for Execuflight only fly trips with no passengers, according to the report.

Both were fired earlier in the year from their previous employers, the report says. Marchese was fired for overall poor performance and Chavez was fired for missing mandatory training. Execuflight hired them both in June and told NTSB investigators they were unaware of the pilots' issues at their prior jobs.

The pilots in the final minutes leading up to the crash discussed the low visibility and concerns about the plane's loss of speed during its decent.

An air traffic controller cleared the pilots to land at Akron Fulton.

The pilots opened the wing flaps to a 45-degree angle about 2:49 p.m. while they were still four miles away from landing, according to the report. Chavez mentioned hearing a high-pitch sound. The two pilots argued about the decreasing speed and drag they experienced. Chavez said he was worried the plane was going to stall.

Two minutes later, Chavez said: "You're diving, you're diving, don't dive" and "Okay, level off guy."

"Oh, oh, oh," is the last thing anyone could be heard saying on the plane before it crashed.

The NTSB report focused a section on asking flight instructors who specialize in Hawker 700s about opening the wing flaps that early in the flight.

The instructors said opening the flaps at that altitude and speed would cause "a lot of drag." The large flaps opened at a 45-degree angle are "like barn doors," another said.

"It would be 'nuts' to do that since it would involve a lot of power, with a lot of drag, and if the pilot was not paying attention to his speed, the airplane could slow and stall," the report says.

Another instructor said the flaps would quickly destabilize the plane and slow it down. None of the instructors were ever trained to open their landing gear that soon, according to the report.

Hawker's own manual, quoted in the report, says: "Lowering the flaps to 45-degrees causes a nose down change in altitude, and because of the extra drag, rate of descent will be increased unless power is added."

Another factor investigators are looking it is the poor visibility the day of the crash.

Visibility at the time was about 1 3/4 miles, according to the report. The clouds allowed for the pilots to the see the ground after they descended to 600 feet from the ground. They came out of the clouds at the lowest allowable level.

The pilots also miscalculated the plane's weight by about 600 pounds and were going too fast for how much the plane actually weighed before the decent, the report says.

They also never created a required alternative flight plan in the event the weather kept them from safely landing. The report says the conditions the day of the crash would have warranted the pilots using the alternative plan.