Not true. You dont even need a BP to get into T3 when transiting. You can pick one up after security. BPs are scanned for the lounges though. I don't know about T5 but you can leave T3 once you've gone in. It does take a bit of time to transfer between terminals, so I wouldn't bother unless you have several hours to wait (I still wouldn't bother).
You cannot enter T5 without a BP neither form landside nor transitting. They are scanned before security check and they are very strict. You can enter T3 without a BP, but only when transitting. Why do you spend the time at the airport? London has so many nice things to do!!!
If you are keen on the lounges you may try the different OW Lounges in T3.
Always a bit of a PITA to go to another terminal with risks of misjudging length of time to make it back before flight closes and delays and all at security etc... But still worth it i reckon... BA at LHR must do it a bit differently...
Are you certain this was Chicago? You mention AC, which I assume is AA's Admirals Club lounge, which implies you were flying with AA. AA operated from Terminal 3 at ORD and there is no concept of an international or domestic terminal. Both types of flights operate from the same terminal with international and domestic services operating from the same gates. Terminal 3 includes concourses G, H, K and L and you can walk between them all. There are AC lounges at concourse G and at the junction of K and L. The Flagship Lounge is at the end of concourse K. So no need for a monorail ride or in and out of security to move between concourses to get to a lounge. Councourse L is the only one without an AC lounge but you don't use a train/monorail to get from L to the lounge at the junction of K and H. So I am a little confised.When i was in Chicago flying out for LHR i went and checked my bags in at the international terminal only be told there was only an AC back at the domestic terminal for some reason, so jumped on the monrail/train thing back to the previous stop and was able to make it through security with my BP and get to the AC and enjoy a few drinks and a shower before making it back to the international one to go through all the security codswallop...
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When i was in Chicago flying out for LHR i went and checked my bags in at the international terminal only be told there was only an AC back at the domestic terminal for some reason ...
I got the impression from "international terminal" (being T5) that BA may be the carrier as AA do not fly from T5. In which case, if A/C access was available in T3 then BA Terraces lounge access should have been available at T5.Are you certain this was Chicago? You mention AC, which I assume is AA's Admirals Club lounge, which implies you were flying with AA. ...
[h=2]Families[/h]Qantas Lounges welcome you when travelling together with your family. In addition to your normal guest allowance you may also bring up to two children, between ages 4 and 17, into lounges operated by Qantas. Children aged 3 years or under are not counted as guests for the purpose of determining the number of guests of the member. If you are travelling with more than two children, the Qantas lounge manager will try to accommodate them, subject to reviewing the space available in the lounge.
Note :
[h=3]Qantas Lounges[/h]
[h=3]BA and oneworld lounges[/h]When entering a British Airways or oneworld lounge, children over 12 years of age are counted as a guest and access is limited accordingly. This is with the exception of the oneworld Los Angeles Tom Bradley Lounge where Qantas Club members may be accompanied by two children up to 18 years of age in addition to their counted guests.
- Children of Qantas Club members aged 18 years and over are counted as a guest of a member if they don't have their own membership.
- The service of alcohol to anyone under the age of 18 years (21 years for USA) is not permitted.
- Children under the age of 18 years must be accompanied by an adult when visiting any lounge, except in the United States of America, where all persons under the age of 21 years must be accompanied by a person aged 21 years or older.
[h=3]Associated lounges[/h]Associated lounges are in ports that Qantas flies to but where it does not operate its own lounge. Our associated lounges are operated by, or on behalf of, other airlines and the child policy varies according to the lounge policy of the particular lounge.
[h=3]Child Access Guide[/h][TABLE="class: basic"]
[TR]
[TH] [/TH]
[TH]Child Age[/TH]
[TH]Number of Children[/TH]
[/TR]
[TR]
[TD]Qantas owned and operated lounge [/TD]
[TD]4 to 17 years[/TD]
[TD]2[/TD]
[/TR]
[TR="class: alt"]
[TD]American Airlines owned lounge[/TD]
[TD]Under 18 years[/TD]
[TD]1 (within North America) 2 (outside of North America)
[/TD]
[/TR]
[TR]
[TD]British Airways owned lounge[/TD]
[TD]Under 12 years[/TD]
[TD]1[/TD]
[/TR]
[/TABLE]
As a First pax, you are entitled to one guest in The Concord Room, who must be traveling on the same flight. Your chances of bringing your family in are zero.
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The BA Arrivals Lounge is not an option (as you need a Longhaul Flight to enter it).