Planes are probably the most costly method to transport good. While even building terminals or buying planes is quite expensive, they excel of course in max speed. These planes are the best method when flying expensive goods at low-mid range.
Same as ever vehicle class, there are also 2 different types of planes available. One that has the highest top speed of all vehicles in game, while carrying as much as a truck can. The other is able to lift even more, while taking it's toll on it's top speed.
Here is a small list of all Planes in game:
Fossna I345 1L[]
type: single prop plane
cargo size: 1
max speed: 205 Mph (330 KM/h)
cost: 4.650.000 $
cost/field: -
release date: start (1960)
Ulfar 1201 1B[]
type: dual prop plane
cargo size: 1
max speed: 232 Mph (373 KM/h)
cost: 5.275.000 $
cost/field: -
release date: start (1960)
Brigass N002 2D[]
type: quad prop plane
cargo size: 2
max speed: 159 Mph (256 KM/h)
cost: 8.135.000 $
cost/field: -
release date: start (1960)
Concord R10 X1[]
type: supersonic plane
cargo size: 1
max speed: 648 Mph (1043 KM/h)
cost: 8.235.000 $
cost/field: -
release date: start (1960)
Ulfar 7002 1B[]
type: dual prop plane
cargo size: 1
max speed: 250 Mph (400 KM/h)
cost: 5.685.000 $
cost/field: -
release date: start (1960)
Brigass N208 3X[]
type: quad prop plane
cargo size: 3
max speed: 149 Mph (240 KM/h)
cost: 10.550.000 $
cost/field: -
release date: start (1960)
Wargass M1000 N2[]
type: triple jet plane
cargo size: 2
max speed: 232 Mph (373 KM/h)
cost: 9.250.000 $
cost/field: -
release date: start (1960)
Omedar 454 R1[]
type: dual jet plane
cargo size: 1
max speed: 362 Mph (582 KM/h)
cost: 5.650.000 $
cost/field: -
release date: start (1960)
Igomar 747 M2[]
type: quad jet plane
cargo size: 2
max speed: 263 Mph (424 KM/h)
cost: 11.050.000 $
cost/field: -
release date: start (1960)
Massator 210 F3[]
type: sixfold jet plane
cargo size: 3
max speed: 239 Mph (384 KM/h)
cost: 14.550.000 $
cost/field: -
release date: start (1960)