United Airlines: Fleet of 700 AIRCRAFTS.

United Airlines

787-8/-9

Cruise Speed: 560 mph
Capacity: 219 passengers
Propulsion: Two General Electric GEnx engines
Wingspan: 197 feet, 4 inches

747-400

Cruise Speed: 567 mph
Capacity: 374 passengers
Propulsion: Four Pratt & Whitney PW4062 engines, rated up to 63,300 pounds thrust each
Wingspan: 211 feet, 5 inches

777-200

Cruise Speed: 550 mph
Capacity: 253-348 passengers
Propulsion: Two General Electric GE90 or two Pratt & Whitney PW4077/4090 engines, rated up to 94,000 pounds thrust each
Wingspan: 199 feet, 11 inches

767-300ER/-400ER

Cruise Speed: 540 mph
Capacity: 174-244 passengers
Propulsion: Two General Electric CF6-80C2B or two Pratt & Whitney PW4060 engines, rated up to 63,300 pounds thrust each
Wingspan: Up to 170 feet, 4 inches

757-200/-300

Cruise Speed: 540 mph
Capacity: 110-216 passengers
Propulsion: Two Rolls-Royce RB211-535 or two Pratt & Whitney PW2040 engines, rated up to 43,700 pounds thrust each
Wingspan: 134 feet, 7 inches

737-700/-800/-900

Cruise Speed: 530 mph
Capacity: 114-173 passengers
Propulsion: Two General Electric CFM56 engines, rated at 26,400 pounds thrust each
Wingspan: Up to 117 feet, 5 inches

A319/A320

Cruise Speed: 530 mph
Capacity: 120-144 passengers
Propulsion: Two IAE V2500-A5 engines, rated up to 27,000 pounds thrust each
Wingspan: 111 feet, 11 inches

CRJ-200/-700

Cruise Speed: 530 mph
Capacity: 50-66 passengers
Propulsion: Two jet engines
Wingspan: Up to 76 feet, 3 inches

EMB 170

Capacity: 70 passengers
Propulsion: Two General Electric CF34-8E jet engines
Wingspan: 85 feet, 4 inches

ERJ 145

Cruise Speed: 530 mph
Capacity: 50 passengers
Propulsion: ERJs powered by two Rolls-Royce AE3007 rated up to 8,900 pounds thrust each
Wingspan: 69 feet, 7 inches

Q200/-300/-400

Cruise Speed: 414 mph
Capacity: 37-74 passengers
Propulsion: Two Pratt and Whitney PW105A engines
Wingspan: 93 feet, 3 inches

EMB 120

Cruise Speed: 325 mph
Capacity: 30 passengers
Propulsion: Two turbine turboprop engines
Wingspan: 64 feet, 9 inches

Saab 340

Cruise Speed: 250 mph
Capacity: 34 passengers
Propulsion: Two turboprop engines
Wingspan: 70 feet, 4 inches

B1900

Cruise Speed: 327 mph
Capacity: 19 passengers
Propulsion: Two Pratt and Whitney PT6A turboprop engines
Wingspan: 58 feet

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Average age of 13.6 years. As of March 2014, its fleet consists of the following aircraft.

United Airlines Mainline Fleet

Aircraft	In Service	Orders	Options	Passengers
				F	B	E+	E	Total
Airbus A319-100	55	16	—	8	—	40	72	120
				8	—	42	78	128
Airbus A320-200	97	14	—	12	—	36	90	138
				12	—	42	90	144
				12	—	42	96	150
Airbus A350-1000	—	35	40	TBA
Boeing 737-700	36	—	—	12	—	40	66	118
				—	12	—	112	124
Boeing 737-800	130	—	—	20	—	—	132	152
				16	—	48	90	154
				16	—	—	144	160
				—	14	—	141	155
Boeing 737-900	12	—	—	20	—	51	96	167
Boeing 737-900ER	82	53	—	20	—	51	96	167
				20	—	—	153	173
				20	—	42	117	179
Boeing 737 MAX 9	—	100	—	TBA
Boeing 747-400	24	—	—	12	52	70	240	374
Boeing 757-200	111	—	—	24	—	50	108	182
				—	16	45	108	169
				—	28	48	66	142
Boeing 757-300	21	—	—	24	—	57	132	213
Boeing 767-300ER	35	—	—	6	26	71	80	183
				—	30	49	135	214
Boeing 767-400ER	16	—	—	—	39	63	140	242
Boeing 777-200	22	—	—	32	—	98	214	344
				36	—	98	214	348
				12	49	92	105	258
				8	40	110	108	266
Boeing 777-200ER	55	—	—	8	40	113	108	269
				—	50	72	145	267
Boeing 787-8	9	10	35	—	36	70	113	219
Boeing 787-9	—	24	—	—	48	63	141	252
Boeing 787-10	—	20	—	TBA
Total	701	273	75

 source- http://www.united.com/ & www.wikipedia.com