Class A

• Dimension : FL180-FL600 including airspace over the waters within 12 nm of  coast of the 48 states and Alaska. 
• Equipment : mode C, two-way radio, IFR equipment. 
• Entry requirement : ATC clearance, IFR plan, Instrument Rating 
• Wx minimum : N/A   

Class B 

• Dimension : It is indivisually tailored for each airport. (usually 10,000’msl) 
• Consists of usually 3 stages like upside down wedding cake.(not exceed 30nm radius) 
• Equipment : mode C, two-way radio 
• Entry requirement : ATC clearance, PPL(STUDENT  PILOT W/T INDORSEMENT)  
• Wx minimum : Vis 3sm, COC 

Class C 

• Dimension : It is individually tailored for each airport.  
• usually core area is up to 4000’AGL with 5nm radius. and shelf area is  from 1200’ to 4000’AGL with 10nm radius 
• Equipment : mode C, two-way radio ( if mode C x, permission is needed) 
• Entry requirement : two-way radio communication, student pilot 
• Wx minimum : Vis 3sm 152 

Class D 

• Dimension : It is usually up to 2,500’AGL with 4nm radius of circle 
• Equipment : two-way radio 
• Entry requirement : student pilot, two-way radio communication 
• Wx minimum : Vis 3sm, 152 

Class E 

• Dimension : controlled airspace that is not designated as class A,B,C,D 
• Equipment : N/A 
• Entry requirement : N/A 
• Wx minimum : Vis 3sm 152 (below 10,000’msl), Vis 5sm 111 (above 10,000’msl) 

Class G 

• Dimension : uncontrolled airspace located anywhere that class A,B,C,D,E has been not designated 
• Equipment : N/A 
• Entry requirement : N/A 
• Wx minimum : below 1,200’AGL = 1sm, COC (DAY), 3sm 152 (NIGHT) above 1,200‘AGL = 1sm, 152 (DAY), 3sm 152 (NIGHT) / above 10,000’MSL = 5sm, 111