 Public opinion towards aviation generally is worsening , based on increasing environmental concerns relating to emissions and noise , and private flying has been criticised by respondents to a government consultation on aircraft noise as a frivolous or selfish activity . In terms of environmental complaints and enquiries made to the CAA that relate specifically to GA , noise is " by far " the most common subject . Half of the 2 @,@ 000 noise complaints made annually to the CAA concern GA operations , most of which relate to aerobatics , helicopters using private sites , air balloon incidents , parachute dropping , and alleged low flying . 
 Public opinion towards aviation generally is worsening , based on increasing environmental concerns relating to emissions and noise , and private flying <a href='been_done' title='1'><mark>has</mark></a> been criticised by respondents to a government consultation on aircraft noise as a frivolous or selfish activity . In terms of environmental complaints and enquiries made to the CAA <a href='null_relcl' title='2'><mark>that</mark></a>relate specifically to GA , noise is " by far " the most common subject . Half of the 2 @,@ 000 noise complaints made annually to the CAA concern GA operations , most of which relate to aerobatics , helicopters using private sites , air balloon incidents , parachute dropping , and alleged low flying . 
Public opinion towards aviation generally is worsening , based on increasing environmental concerns relating to emissions and noise , and private flyin done been criticised by respondents to a government consultation on aircraft noise as a frivolous or selfish activity . In terms of environmental complaints and enquiries made to da CAA relate specifically to GA , noise is " by far " the most common subject . Half of tda2 @,@ 000 noise complaints made annually to thdaAA concern GA operations , most of which relate to aerobatics , helicopters using private sites , air balloon incidents , parachute dropping , and alleged low flying .