My top five are:

#1
RNO-LAS-SAN WN 737-700
SAN-JFK B6 A-320
JFK-LHR BA 747-400
LHR-BAH GF A-340
BAH-BEY GF 767-300


#2
LAS-SLC DL 757-200
SLC-JFK DL 767-300
JFK-JNB SA 747-400


#3
LAS-PIT US 737-300
PIT-MIA US 737-300
MIA-CPT SA 747-400


#4
CPT-MIA SA 747-400
MIA-IAH CO MD-80
IAH-LAS CO MD-80


#5
IND-PHL 9E CRJ-200
PHL-LHR BA 777-200
LHR-KWI KU 777-200