who threw the longest pass in the NFL?? (Who and when)?

Answer 1

all of these were 99 yard TD passes

Frank Filchock to Andy Farkas - Washington vs. Pittsburgh October 15, 1939

George Izo to Bobby Mitchell - Washington vs. Cleveland September 15, 1963

Karl Sweetan to Pat Studstill - Detriot vs. Baltimore October 16, 1966

Sonny Jurgensen to Gerry Allen - Washington vs. Chicago September 15, 1968

Jim Plunkett to Cliff Branch - L.A. Raiders vs. Washington October 2, 1983

Ron Jaworski to Mike Quick - Philadelphia vs. Atlanta November 10, 1985

Stan Humphries to Tony Martin - San Diego vs. Seattle September 8, 1994

Brett Favre to Robert Brooks - Green Bay vs. Chicago September 11, 1995

Trent Green to Marc Boerigter - Kansas City vs. San Diego December 22, 2002

Jeff Garcia to Andre Davis - Cleveland vs. Cincinnati October 17, 2004

Answer 2

Many people have thrown a 99-yard pass, the longest possible in the NFL. Here is a list courtesy of NFL.com:

Frank Filchock (to Farkas), Washington vs. Pittsburgh, Oct. 15, 1939
George Izo (to Mitchell), Washington vs. Cleveland, Sept. 15, 1963
Karl Sweetan (to Studstill), Detroit vs. Baltimore, Oct. 16, 1966
Sonny Jurgensen (to Allen), Washington vs. Chicago, Sept. 15, 1968
Jim Plunkett (to Branch), L.A. Raiders vs. Washington, Oct. 2, 1983
Ron Jaworski (to Quick), Philadelphia vs. Atlanta, Nov. 10, 1985
Stan Humphries (to Martin), San Diego vs. Seattle, Sept. 18, 1994
Brett Favre (to Brooks), Green Bay vs. Chicago, Sept. 11, 1995
Trent Green (to Boerigter), Kansas City vs. San Diego, Dec. 22, 2002
Jeff Garcia (to Davis), Cleveland vs. Cincinnati, Oct. 17, 2004