...straight in approach to 22's at MDW are negated by the location of the Sears Tower (OK, now Willis Tower for you brits
) That also keeps an ILS from being installed. An MLS was installed for 22L and was operational just before Midway Airlines quit flying (the first ML). It never was officially commissioned due to ML's failure. Two MD87's came equipped from McD with MLS receivers (government paid for it).
I used to use the non-published precision DME for avionics ops checks on the ground. The system was kept running for a couple of years (original vendor contract), before being removed from the field.
besides the 31 ILS circle to 22 (fondly described as the 'circle to die' approach back in the 60's and 70's), they also fly the 4 ILS, break-off and circle to 13. As has been stated, depends on winds and what they are doing at ORD.
OK, again, sorry for the diversion, back to the FEDX MD11?