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Mrs. SuuKyi’s aides have offered few details about her trip aside from the destinations, saying only that she will pack medicine for motion sickness.

“She gets airsick and seasick very easily. She will have to take her pills to prevent airsickness,” said Win Htein, a senior official from her National League for Democracy party. He said she was typically stoic ahead of her travels: “She doesn’t look too excited about it.”

Thailand was not part of the original itinerary, but Mrs. SuuKyi decided last week to attend the economic forum. She has a Friday speaking slot that is bound to be the event’s main attraction.

Mrs. SuuKyi’s appearance at the conference threatened to upstage that of Myanmar President Thein Sein, but he canceled over the weekend, citing “urgent matters” at home, said Thai Foreign Ministry spokesman Thani Thongphakdi. He rescheduled his first official visit to Thailand for next week.

Thein Sein took power last year from the military junta following elections that were deemed unfair by international observers. Since then, he has surprised much of the world by engineering sweeping reforms, though military leaders still have great control over the country.

Since Mrs. SuuKyi’s release, many international dignitaries have visited her in Myanmar, including U.S. Secretary of State Hillary Rodham Clinton in December and British Prime Minister David Cameron in April. Mr. Cameron suggested she visit her “beloved Oxford” in June.

Mrs. SuuKyi replied at the time, “Two years ago I would have said, ‘Thank you for the invitation, but sorry,’ but now I am able to say, ‘Perhaps,’ and that’s great progress.”