Not really.
There is nothing suspect in thinking that your share price is more or less at a peak and that economic conditions (note I do not say internal BA issues) are such that the share price is, in your opinion, likely to weaken.
The fact that 10 directors have done this may just mean that they are spotting what to many people seem to be obvious signs of an impending slowdown.
they are reacting accordingly, as is their right.
I'd be careful about accusing people of a criminal offence myself, as it is defamatory.
I am in no way connected to BA, I would like to add.