# Is it coincidence that the Electron has very similar dimensions to the Pegasus?

Orbital ATK Pegasus: 16.9 m × 1.27 m

RocketLab Electron: 17 m × 1.2 m

Apart from that, the two rockets are very different: the Pegasus is a solid-fuel, air-launched rocket with a mass of 18.5 t and can bring 440 kg to LEO, while the liquid-fueled Electron weighs in at only 10.5 tons and gets ≈200 kg to LEO.

Is there more to this? Has RocketLab perhaps voiced any intent of air-launching the Electron at some point?

• +1 You might want to add that the LOX tank has a large area/volume ratio and not much room for insulation, so the boil-off rate might be high, then mention how long it takes to get to launch hight, how to feed make-up LOX from the plane, etc. – uhoh Nov 11 '18 at 0:44