Uhhm... A Plane this big is very easy to identify - any Tower Guy in an Airport knows their Signature. Now let us talk obout the People who know the Signature of a Rocket on a modern Radar Screen...
No Tube and Transistor Power anymore - the Cold War ist over - for now, that is. At first - Planes as an Airbus are `slow´. Rockets are not. And ICBMs for Example can cross the Surveillence Passageway of some `Weather Satellites´. Other Rockets (like ATAs) are Way too small to be detected by civil Radar Systems - and ATGs are too fast - and therefore too short in the Air for a secure Verification - if there is no military Surveillance Command Post active to confirm this Signature. So much for that. But if You mean, a Passenger Plane looks much less suspicious than a Rocket - okay, there You have a Point. There aren´t any... `Passenger Rockets´ around, as far as I know.
Then there is the `Law of Statistics´. Some of these Stochastic Guys say `Planes are the safest Way to travel.´ Oh, yeah, of Course - because in Case of Cars, Trains and so on - they are clearly outnumbered. And If You have only a few Planes, only a few Accidents can occur. BUT: If something happens, a Plane cannot stop besides the Street to have `a Look on the Engine´. And: They are big and stuffed with People - to make all this effordable. So if a Plane gets lost - many People get lost, too.
Then there are Physics - a Car only needs to roll. If something wears off - like some Bumpers or a Fender - it rolls on. By a Plane, Everything is designed in a Way that allows it to fly with an Amount of Energy that is as small as possible. And the Atmosphere can be a nasty Place. Ever looked out of a Window while sitting in a Plane - and looked at the wobbling Wings? Not a Sight for everyone. Material Stresses can occur, Bolts can break and so on... A Fault in the Hydraulics, Pressure Loss, or much worse: A sudden Pressure Loss (which can be really disastrous, look at the COMET-Accidents in the early 50´s). Flying may look nice - but it is hard - especially for huge Metal-made Machines, that weigh more as a Blue Whale.
So in my Case the only Conspiracy lies in the Wonder why there are not more Planes, that are missing. But I think, there are - most of them are only not big enough worth a global Headline.
And in my Eyes - the Fun Possibility just doesn´t exist - and there is nothing to enjoy. And I think everyone, who is waiting at the Airport for their Friends, Lovers and Relatives thinks the same. But this is only my Opinion.