 The growth in Commercial Air Transport ( CAT ) has eroded the operational freedom of GA , both in the air and on the ground at larger airports . Difficulty with access to larger airports is compounded by a decline in the number of aerodromes generally , and existing sites are often threatened with closure and re @-@ development for more profitable uses . The UK planning system is designed to focus on local issues , and consideration of the national impact of GA operations is not within its remit . This makes aerodrome development difficult , often subjecting those that successfully negotiate the process to restrictions in use . 
 The growth in Commercial Air Transport ( CAT ) <a href='been_done' title='1'><mark>has</mark></a> eroded the operational freedom of GA , both in the air and on the ground at larger airports . Difficulty with access to larger airports is compounded by a decline in the number of aerodromes generally , and existing sites are often threatened with closure and re @-@ development for more profitable uses . The UK planning system is designed to focus on local issues , and consideration of the national impact of GA operations <a href='negative_concord' title='2'><mark>is</mark></a> <a href='negative_concord' title='3'><mark>not</mark></a>within its remit . This <a href='uninflect' title='4'><mark>makes</mark></a> aerodrome development difficult , often subjecting those <a href='null_relcl' title='5'><mark>that</mark></a>successfully negotiate the process to restrictions in use . 
The growth in Commercial Air Transport ( CAT ) done eroded the operational freedom of GA , both in the air and on da ground at larger airports . Difficulty with access to larger airports is compounded by a decline in tdanumber of aerodromes generally , and existing sites r often threatened with closure and re @-@ development fir more profitable uses . The UK plannin system is designed to focus on local issues , and consideration of the national impact of GA operations ain't within its remit . This make aerodrome development difficult , often subjecting those successfully negotiate thdarocess to restrictions in use .