Apologies - the system seems to reduce everything to a single space not making this clear
Try this:
Type Engines Seats OEW_kg kg/seat
A300-600 CF6-80C2A5 212 90,300 426
A310-300 CF6-80C2A8 192 79,666 415
A318-100 CFM56-5B 81 39,035 482
A319-100 CFM56-5B6 96 40,350 420
A320-200 CFM56-5B4 109 42,100 386
A321-200 CFM56-5B3 132 48,140 365
A330-200 CF6-80E1A4 236 120,500 511
A330-300 CF6-80E1A4 236 124,300 527
A340-200 CFM56-5C4 225 125,650 558
A340-300 CFM56-5C4 260 129,850 499
A340-500 Trent553 269 170,300 633
A340-600 Trent556 294 176,900 602
B737-500 CFM56-3C1 76 31,950 420
B737-300 CFM56-3C1 91 31,869 350
B737-400 CFM56-3C1 106 34,810 328
B737-600 CFM56-7B22 76 36,900 486
B737-700 CFM56-7B22 91 38,150 419
B737-800 CFM56-7B27 121 41,150 340
B737-900 CFM56-7B27 136 42,490 312
B747-400 CF6-80C2B5F 250 183,810 735
B747-400 CF6-80C2B5F 358 181,120 506
B747-400X CF6-80C2B5F 358 183,810 513
B747-400X GP7000 423 190,500 450
B757-200 PW2040 132 58,390 442
B757-300 PW2043 162 63,650 393
B767-200 CF6-80C2B8F 158 84,690 536
B767-300 CF6-80C2B7F 194 90,540 467
B767-400 CF6-80C2B8F 208 102,690 494
B777-200 GE-90-94B 260 143,790 553
B777-200 GE-90-115B 260 155,990 600
B777-300 GE-90-95B 336 158,480 472
B777-300 GE-90-115B 336 169,190 504
B717-200 BR715C1-30 58 32,110 554
MD87 JT8D-217B 74 35,003 473
MD83 JT8D-219 94 38,737 412
MD90-30 V2528-D5 100 41,178 412
MD11 PW4460 268 132,800 496
CRJ-200 CF343B1 34 13,740 404
CRJ-700 CF348C1 49 19,731 403
RJ-70 LF507-1F 65 23,600 363
RJ-85 LF507-1F 77 24,380 317
RJ-100 LF507-1F 92 24,750 269
ERJ-135 AE3007A 33 511,200 320
ERJ-145ER AE3007A 147 11,840 252