A rock-steady source of good information sent me some data on launches by the Space Transportation System (STS), otherwise known as the space shuttle. He got it from NASA so I guess they know what they are talking about.
Seems that STS has been known to use an inclination greater than 51 degrees before and they plan to use it again since this takes them to places like the International Space Station.
On that inclination, they transit the Grand Banks and, as my solid source reminded me, that is why St. John's and especially Goose Bay are identified as possible landing sites should the STS encounter some problems.
At the risk of causing the Premier to have apoplexy, I thought it best to share this information with my faithful audience. It certainly helps to put the Titan 4B launch into perspective.
In the list that follows, I have edited so that only the launch inclinations greater than 50 degrees are included. Note that inclination is taken using the Equator as zero degrees. A 90 degree inclination is a polar orbit heading over the North Pole first. A 180 inclination would put something into orbit along the Equator opposite to the Earth's rotation. For a better discussion of STS mission inclinations, try this page.
Here's the editted list. Note the frequency the STS uses those high inclinations.
STS//Inclination// Notes
STS-9 57.0 HIGH
41g 51.7 HIGH
STS-51-B 57.0 HIGH
STS-61-A 57.0 HIGH
STS-27 57.0 HIGH
STS-28 57.0 HIGH
STS-36 62.0 HIGH
STS-39 57.0 HIGH
STS-48 57.0 HIGH
STS-42 57.0 HIGH
STS-45 57.0 HIGH
STS-47 57.0 HIGH
STS-53 57.0 HIGH
STS-56 57.0 HIGH
STS-59 56.9 HIGH
STS-60 56.4 HIGH
STS-64 56.9 HIGH
STS-68 57.0 HIGH
STS-66 57.0 HIGH
STS-63 51.6 HIGH
STS-71 51.6 HIGH
STS-74 51.6 HIGH
STS-76 51.6 HIGH
STS-79 51.7 HIGH
STS-81 51.6 HIGH
STS-84 51.7 HIGH
STS-85 57.0 HIGH
STS-86 51.6 HIGH
STS-89 51.6 HIGH
STS-88 51.6 HIGH
STS-91 51.7 HIGH
STS-92 51.6 HIGH
STS-96 51.6 HIGH
STS-97 51.6 HIGH
STS-98 51.5 HIGH
STS-99 57.0 HIGH
STS-101 51.6 HIGH
STS-102 51.5 HIGH
STS-106 51.6 HIGH
STS-100 51.6 HIGH
STS-104 51.6 HIGH
STS-105 51.6 HIGH
STS-108 51.6 HIGH
STS-110 51.6 HIGH
STS-111 51.6 HIGH
STS-112 51.6 HIGH
STS-113 51.6 HIGH
Planned future launches
STS-114 51.6 HIGH
STS-121 51.6 HIGH
STS-115 51.6 HIGH
STS-116 51.6 HIGH
STS-117 51.6 HIGH
