A B757-200 flight crew misunderstood the intersection at which ATC wanted them to cross at 11000 ft.

Attributes
ACN	886782
Time
Date	201005
Local Time Of Day	0601-1200
Place
Locale Reference	C90.TRACON
State Reference	IL
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR ROYKO THREE
Flight Plan	IFR
Person 1
Function	Pilot Flying First Officer
Experience	Flight Crew Last 90 Days 80 Flight Crew Total 12000 Flight Crew Type 500
Person 2
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 190 Flight Crew Total 22000 Flight Crew Type 6000
Events
Anomaly	Deviation - Altitude Crossing Restriction Not Met Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy

Narrative:

We were given a clearance to cross looth intersection [on the royko three RNAV STAR to ord] at 11000 ft and followed the normal point and verify procedures. Upon crossing boone at approximately 14000 ft; the controller asked if we were given a clearance to cross boone at 11000 ft. I would suggest a change in the intersection names to eliminate the 'oo' sound from two nearby intersections used interchangeably for the same altitude clearance.

Original NASA ASRS Text

Title: A B757-200 flight crew misunderstood the intersection at which ATC wanted them to cross at 11000 FT.

Narrative: We were given a clearance to cross LOOTH intersection [on the ROYKO THREE RNAV STAR to ORD] at 11000 FT and followed the normal point and verify procedures. Upon crossing BOONE at approximately 14000 FT; the Controller asked if we were given a clearance to cross BOONE at 11000 FT. I would suggest a change in the intersection names to eliminate the 'oo' sound from two nearby intersections used interchangeably for the same altitude clearance.

Data retrieved from NASA's ASRS site as of April 2012 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.