Ok I Sucessfully did this with in 15 mins ok this is my plan on doing this
Mats Needed for this!:
Swiftness potions and a lil bit of knowledge
Step1.
Get a Frost Mage/ Elemental Shaman/ Either DK tank or Warrior Tank/ Priest healer (druid healer works to)/ and any melee DPS make sure all of there DPS is above 1.8k and about 1.7 SP for heals and 540 Def rating
Step2. Make sure to get all Crates Exposed
Step3. Make sure your group gets buffed fulling with intellect/Horn of the Winter; Warrior buff +2500 health/ Totems/ Fortitude or GoW [ Gift of Wild ]
Step4. After talking to arthas, make sure you go quite a ways in to where the fork in the road is where it splits and wait there till it starts
Step5. when it starts go Right; Left; Right; Left; Right; Stay Right; there is 5 mobs gone so now you have 5/10 done now Boss, Boss has masive aoe's so thats where the mage and Shaman come in just dps him and watch out for that AoE keep it away from the healer and Ranged, Continue pattern untill 10.
Step6. Ok Arthas will take you into a lil farm on the right side go in the farm and start killing the Dragons inside then bosses blah blah ok now ur around the last part make sure you have either Swiftness potions or Swiftness potions.ok now use them to get across to other side to finall boss kill him then you should have at least 9-13 mins left if you do it correctly with no wipes
Step7. Follow down path and Kill the final boss the heroic boss k after you kill him you should have at least 4-7 mins left and then roll on mount if it drops the mount has a 84% chance on droping so good luck to all
Step8. Fly around northrend rubbing ur mount in other peoples faces
lol kk gl and if you do wipe make sure the shammy will self rez and revive healer
then double rezes