“We have found that using a simulator integrated curriculum with training available in a convenient location has greatly increased frequency of training for our students, and this in turn has enabled us to keep our student retention rates of greater than 96%.” Source: Gloria Liu, General Manager at Zulu Flight Training.
Concerning altitude/flight level, the term means to remain at the altitude/flight level specified. The phrase "climb and" or "descend and" normally precedes "maintain" and the altitude assignment; e.g., "descend and maintain 5,000."
The Canadian Bushplane Heritage Centre in Sault Ste. Marie, Ontario is dedicated to preserving the history of Bush Flying and Forest Protection in Canada.