Narrative:

Aircraft X called to depart VFR flight following to udd. He made a right turn at shoreline; as is issued in his instructions. Before I switched him to sct; I told him to make sure he cleared all the way out of class D to west and to remain clear of class D before turning east. He asked if I wanted him clear of D[elta]. I explained we sometimes have a problem with aircraft departing to east. They contact sct and then turn around and fly right back through our airspace. I told him to make sure when he was west to stay outside or above our airspace. He indicated he understood and I switched him. Less than a minute later I observed him turn around and start to fly back towards airport at 1;800 ft. I tried to call him but he did not respond.I had just had a discussion with another controller about this yesterday. Our instructions [are] to VFR flight following aircraft off of smo is to turn right at the shoreline. I think it should include instructions to clear the class D to west and then remain clear. The reason is; many pilots seem unaware that just because they are talking to approach control; does not let them enter another airspace. We switch them in our airspace; thinking they will continue west and they turn and fly though final at dangerous altitudes. (Because they never left D[elta] when we switch them; this is legal; but not good!) we have the same problem with pilots coming to us from the mini route over lax or inbound leaving flight following. They think that because they have a beacon code and were talking to someone; they are okay to enter without establishing radio communications. I think this is a pilot instruction problem also.

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Original NASA ASRS Text

Title: SMO Tower Controller reported an aircraft experienced an Class Delta airspace violation after leaving it west bound and then entering it again without clearance eastbound.

Narrative: Aircraft X called to depart VFR flight following to UDD. He made a right turn at shoreline; as is issued in his instructions. Before I switched him to SCT; I told him to make sure he cleared all the way out of Class D to west and to remain clear of Class D before turning east. He asked if I wanted him clear of D[elta]. I explained we sometimes have a problem with aircraft departing to east. They contact SCT and then turn around and fly right back through our airspace. I told him to make sure when he was west to stay outside or above our airspace. He indicated he understood and I switched him. Less than a minute later I observed him turn around and start to fly back towards airport at 1;800 FT. I tried to call him but he did not respond.I had just had a discussion with another controller about this yesterday. Our instructions [are] to VFR flight following aircraft off of SMO is to turn right at the shoreline. I think it should include instructions to clear the Class D to west and then remain clear. The reason is; many pilots seem unaware that just because they are talking to Approach Control; does not let them enter another airspace. We switch them in our airspace; thinking they will continue west and they turn and fly though final at dangerous altitudes. (Because they never left D[elta] when we switch them; this is legal; but not good!) We have the same problem with pilots coming to us from the mini route over LAX or inbound leaving flight following. They think that because they have a beacon code and were talking to someone; they are okay to enter without establishing radio communications. I think this is a pilot instruction problem also.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.