Our flight is shortly before iftaar. Are we still permitted to fast on this day? We land the following day at 9am after transiting. Hence are we able to fast on the day of travel and the following day of arrival?

If you leave your place of permanent residence after Duhr then you can keep your fast. So in this example yes if you live in a UK city and departing from that city after Duhr then you must keep fast

However on reaching Dar, if you intend to stay there 10 days or more or it’s your hometown etc then if you reach before Duhr you can fast that day