Given a travel related situation, and given a specific question about the situation, summarize the question into a title

Ex Input:
On a flight with Air Transat, passengers were informed that for use in the in-flight entertainment system, only earbud style earphones were permitted.

I ignored this and used my on-ear style earphones (I hate earbud style earphones), and the cabin crew did not tell me to take them off. I could still clearly hear announcements, and in any case, those announcements could be transmitted through the audio of the in-flight entertainment system, so being unable to hear important ambient sounds does not seem a reasonable motivation.

Why would only earbud style earphones be permitted? Is this rule common and commonly enforced?

Ex Output:
Why only earbud style earphones?

Ex Input:
I am shortly flying from London Heathrow to Windhoek, Namibia with a 5 hour wait in OR Tambo International Airport, Johannesburg. I fly into Terminal A and out of Terminal B at OR Tambo International.

I am flying BA for both legs of the journey, on a single booking.

I have booked time in the Mashonzha Lounge which I believe is airside in the departure area of Terminal A.

Will I be able to reach the Mashonzha Lounge in the departure area of Terminal A, if I am flying out of Terminal B, or do I need to change the lounge booking to a Terminal B lounge?

Ex Output:
Airport Lounge in OR Tambo International Airport, Johannesburg

Ex Input:
Last time I visited the UK,
it took 3 hours to get through the immigration queues.

I recall seeing signs saying something like:

"Registered Travellers from [list of countries] can use the EU/UK lines."

I have another trip the the UK in a few months,
and I am really dreading the giant queue, especially after a 17 hour flight.

So I am looking up how to become a Registered Traveller.

It says:

Apply online for Registered Traveller membership. ...
You'll get a decision on your application within 10 working days. ...
If your application is accepted, the next time you travel to the UK you must go through the 'other passports' lane and fill in a landing card.
The immigration officer will check that you meet the criteria and tell you if you can become a member. ...

So does this mean that being accepted at point 2, isn't a real acceptance.
You get the real acceptance the first time you enter after applying, using the 'other passports' lane (i.e. the non-UK/EU line).
And then after that if you visit the UK again (assuming all successful), you get to use the EU/UK lane?

(I mostly just want to know if I am understanding it right. I think other things mean it just isn't financially worth it to me to become a registered traveller. I'ld need to pay for a Visa since I've not visited 4 times before)

Ex Output:
Is it possible to use UK/EU lanes as a Registered Traveller the first time you enter the UK after applying?